I will walk in the presence of Jehovah. To walk in the presence of God is, in my opinion, equivalent to living under his charge. And thus David expects to enjoy his safety continually. For nothing is more desirable than that God should be upon the watch for us, that our life may be surrounded by his protecting care. The wicked, indeed, regard themselves as secure, the farther they are from God; but the godly consider themselves happy in this one thing, that he directs the whole tenor of their life. God adding, in the land of the living, he means to point out to us the course that we are expected to pursue; and that, almost every moment of time, fresh destructions press upon us, if he overlook us.

I will walk before the Lord - Compare Psalm 27:13, note; Isaiah 38:20, note. This expresses a full belief that he would live, and a purpose to live "before the Lord;" that is, as in his presence, in his service, and enjoying communion with him.

I will walk before the Lord - אתהלך ethhallech, I will set myself to walk. I am determined to walk; my eyes are now bright ened, so that I can see; my feet are strengthened, so that I can walk; and my soul is alive, so that I can walk with the living.
The Vulgate, the Septuagint, the Ethiopic, the Arabic, and the Anglo-Saxon end this Psalm here, which is numbered the cxivth; and begin with the tenth verse another Psalm, which they number cxvth; but this division is not acknowledged by the Hebrew, Chaldee, and Syriac.

I will (e) walk before the LORD in the land of the living.
(e) The Lord will preserve me and save my life.

I will walk before the Lord in the land of the living. As in the sight of the omniscient God, according to his word and will, and in such manner as to please him. So Enoch's walking with God is by the apostle explained of pleasing him; compare Genesis 5:22, and so the Septuagint, Vulgate Latin, and Arabic versions render it, "I will please the Lord"; or, as the Syriac and Ethiopic versions; "that I may please the Lord"; be grateful to him; or walk gratefully and acceptably before him, sensible of the obligations I am under to him: and this, in the strength of grace, he determined to do "in the land of the living"; in this world, where men live, and as long as he lived in it; or in the church of God, among the living in Jerusalem, with whom he resolved to walk in all the commandments and ordinances of the Lord. The land of Canaan is thought by Jarchi and Kimchi to be meant; and this being a type of heaven, the meaning may be, that he should walk and dwell where living and glorified saints are to all eternity; and so it is an expression of his faith of future glory and happiness, agreeably to what follows.

walk before the Lord--act, or live under His favor and guidance (Genesis 17:1; Psalm 61:7).
land of the living-- (Psalm 27:13).