(A Psalm of David, when he changed his behaviour before Abimelech; who drove him away, and he departed.} I will bless the LORD at all times: his praise shall continually be in my mouth.

I will bless Jehovah at all times: His praise shall continually be in my mouth.

For David, when he changed his countenance before Achimelech, who dismissed him, and he went his way. [1 Kings 21.] I will bless the Lord at all times, his praise shall be always in my mouth.

A Psalm of David; when he changed his demeanour before Abimelech, who drove him away, and he departed.

I will bless Jehovah at all times. [1] David here extols the greatness of God, promising to keep in remembrance during his whole life the goodness which he had bestowed upon him. God assists his people daily, that they may continually employ themselves in praising him; yet it is certain that the blessing which is said to be worthy of everlasting remembrance is distinguished by this mark from other benefits which are ordinary and common. This, therefore, is a rule which should be observed by the saints -- they should often call into remembrance whatever good has been bestowed upon them by God; but if at any time he should display his power more illustriously in preserving them from some danger, so much the more does it become them earnestly to testify their gratitude. Now if by one benefit alone God lays us under obligation to himself all our life, so that we may never lawfully cease from setting forth his praises, how much more when he heaps upon us innumerable benefits? In order to distinguish the praise which he had before said would be continually in his mouth from the empty sound of the tongue, in which many hypocrites boast, he adds, in the beginning of the second verse, that it would proceed from the heart.

Footnotes

1 - "That is, in all circumstances; in every posture of my affairs." -- Horsley.

I will bless the Lord - I will praise him; I will be thankful for his mercies, and will always express my sense of his goodness.
At all times - In every situation of life; in every event that occurs. The idea is, that he would do it publicly and privately; in prosperity and in adversity; in safety and in danger; in joy and in sorrow. It would be a great principle of his life, expressive of the deep feeling of his soul, that God was always to be regarded as an object of adoration and praise.
His praise shall continually be in my mouth - I will be constantly uttering his praises; or, my thanks shall be unceasing. This expresses the "purpose" of the psalmist; and this is an indication of the nature of true piety. With a truly pious man the praise of God is constant; and it is an indication of true religion when a man is "disposed" always to bless God, whatever may occur. Irreligion, unbelief, scepticism, worldliness, false philosophy, murmur and complain under the trials and amidst the dark things of life; true religion, faith, love, spirituality of mind, Christian philosophy, see in God always an object of praise. People who have no real piety, but who make pretensions to it, are disposed to praise and bless God in times of sunshine and prosperity; true piety always regards him as worthy of praise - in the storm as well as in the sunshine; in the dark night of calamity, as well as in the bright days of prosperity. Compare Job 13:15.

I will bless the Lord at all times - He has laid me under endless obligation to him, and I will praise him while I have a being.

"[A Psalm] of David, when he changed his behaviour before Abimelech; who drove him away, and he departed." I will bless the LORD (a) at all times: his praise [shall] continually [be] in my mouth.
(a) He promised never to become unmindful of God's great benefit for his deliverance.

I will bless the Lord at all times,.... That is, ascribe blessing, give honour, praise, and glory to him, both as the God of nature and providence, for every temporal mercy; and that every day, and at all times in the day; since these are renewed every morning, and continue all the day long: and as the God of grace, for all spiritual blessings; and that continually, because these last always; they are irreversible, unchangeable, and without repentance; yea, saints have reason to bless God in times of adversity as well as prosperity, since it might have been worse with them than it is; they have a mixture of mercy in all, and all things work together for their good;
his praise shall continually be in my mouth; not the "praise" of which God is the author, but of which he is the object; which is due unto him, and is given him on account of the perfections of his nature, and the works of his hands, and the blessings of his providence and grace; this, the psalmist says, should be in his mouth: his meaning is, that he should not only retain in his heart a grateful sense of the divine favours, but should express it with his lips; should both make melody in his heart to the Lord, and vocally sing his praise; and that "continually", as long as he lived, or had any being, Psalm 146:2.

If we hope to spend eternity in praising God, it is fit that we should spend much of our time here in this work. He never said to any one, Seek ye me in vain. David's prayers helped to silence his fears; many besides him have looked unto the Lord by faith and prayer, and it has wonderfully revived and comforted them. When we look to the world, we are perplexed, and at a loss. But on looking to Christ depends our whole salvation, and all things needful thereunto do so also. This poor man, whom no man looked upon with any respect, or looked after with any concern, was yet welcome to the throne of grace; the Lord heard him, and saved him out of all his troubles. The holy angels minister to the saints, and stand for them against the powers of darkness. All the glory be to the Lord of the angels. By taste and sight we both make discoveries, and have enjoyment; Taste and see God's goodness; take notice of it, and take the comfort of it. He makes all truly blessed that trust in him. As to the things of the other world, they shall have grace sufficient for the support of spiritual life. And as to this life, they shall have what is necessary from the hand of God. Paul had all, and abounded, because he was content, Philippians 4:11-18. Those who trust to themselves, and think their own efforts sufficient for them, shall want; but they shall be fed who trust in the Lord. Those shall not want, who with quietness work, and mind their own business.

On the title compare 1-Samuel 21:13. Abimelech was the general name of the sovereign (Genesis 20:2). After celebrating God's gracious dealings with him, the Psalmist exhorts others to make trial of His providential care, instructing them how to secure it. He then contrasts God's care of His people and His punitive providence towards the wicked. (Psalm. 34:1-22)
Even in distress, which excites supplication, there is always matter for praising and thanking God (compare Ephesians 5:20; Philippians 4:6).

(Hebrews.: 34:2-4) The poet begins with the praise of Jahve, and calls upon all the pious to unite with him in praising Him. The substantival clause Psalm 34:2, is intended to have just as much the force of a cohortative as the verbal clause Psalm 34:2. אברכה, like ויגרשׁהו, is to be written with Chateph-Pathach in the middle syllable. In distinction from עניּים, afflicti, ענוים signifies submissi, those who have learnt endurance or patience in the school of affliction. The praise of the psalmist will greatly help to strengthen and encourage such; for it applies to the Deliverer of the oppressed. But in order that this praise may sound forth with strength and fulness of tone, he courts the assistance of companions in Psalm 34:4. To acknowledge the divine greatness with the utterance of praise is expressed by גּדּל with an accusative in Psalm 69:31; in this instance with ל: to offer גּדלּה unto Him, cf. Psalm 29:2. Even רומם has this subjective meaning: with the heart and in word and deed, to place the exalted Name of God as high as it really is in itself. In accordance with the rule, that when in any word two of the same letters follow one another and the first has a Sheb, this Sheb must be an audible one, and in fact Chateph Pathach preceded by Gaja (Metheg), we must write וּנרוממה.