I have thy testimonies as an inheritance for ever. He again confirms the sentiment, which cannot be too often repeated, That the law of God was more precious to him than all the pleasures, riches, and possessions, of the world. I have said, that it is not in vain that these things are so often repeated; for we see how violently the men of the world boil to gratify their unruly lusts, with what multiplied anxieties they are agitated, while they are unceasingly coveting innumerable objects; and, in the meantime, scarcely one in a hundred is, in a moderate degree, aiming to apply his mind to the study of the Divine law. The prophet, then, to stir us up by his own example, asserts, that he took such pleasure in God's, testimonies as to esteem nothing more precious. It is love only which leads us to set a value on any object; and, therefore, it is requisite, in order to our observing the Divine law with the reverence due to it, that we begin with this delight in it. It is not wonderful, if God's testimonies convey to our minds a joy, which, causing us to reject and despise all other things, holds our affections fast bound to them. What can be sweeter than to have heaven opened to us, that we may come freely into the presence of God, when, adopting us to be his children, he pardons our sins? What can be more desirable than to hear that he is so pacified towards us, as to take upon himself the care of our life? This I have thought good to observe briefly, that we might not think it strange to find David rejoicing so greatly in God's law. The similitude of inheritance is of frequent occurrence in the Scriptures; and we apply the designation of inheritance to that which we hold in the highest estimation, so that we are contented to be deprived of all other things, provided we retain the safe and full possession of that one thing. Accordingly, the prophet intimates, that whatever good things he had obtained he accounted them as adventitious, and that the truths revealed in God's word alone were to him as an inheritance. Without the Divine word all other things were in his estimation as nothing; so that he could willingly leave to others, riches, honors, comforts, and pleasures, provided he possessed this incomparable treasure. It is not meant to say that he; altogether despised the temporal benefits which God bestows, but his mind was not bound fast to them.

Thy testimonies - Thy law; thy revealed will; the revelation which thou hast given considered as thy solemn "testimony" as to what is true and right.
Have I taken as an heritage for ever - As my inheritance; as my property; as that which I consider to be of real and permanent value. The Hebrew word used here - נחל nachal - means to receive as a possession; to acquire; to possess as wealth; and then, to inherit. It is usually applied to the possession of the promised land as an inheritance. Here it means that the law of God was to him as such a possession. He regarded it as one does a rich inheritance. He chose it as his portion above all things else.
For they are the rejoicing of my heart - My happiness is in them. I find constant comfort in them. See Psalm 119:77, Psalm 119:92. Compare the notes at Psalm 1:2.

As a heritage - In Psalm 119:57 he says, God is my portion, חלקי chelki. In this he says, Thy testimonies have I taken as a heritage, נחל nachal. To these he was heir; he had inherited them from his fathers, and he was determined to leave them to his family for ever. If a man can leave nothing to his child but a Bible, in that he bequeaths him the greatest treasure in the universe.

Thy testimonies have I taken as an (e) heritage for ever: for they [are] the rejoicing of my heart.
(e) I esteemed no worldly things, but made your word my inheritance.

Thy testimonies have I taken as an heritage for ever,.... The Scriptures, which testify of Christ and of his grace, and of the mind and will of God, are a portion of themselves; and a goodly heritage they are, better than thousands of gold and silver, preferable to all worldly inheritances; as they have been to many, who have forsaken all for Christ and his Gospel. These, like an inheritance, have been transmitted from father to son, from one age of the church to another, in successive generations; nor shall they depart from her, nor from her seed and seed's seed, from henceforth and for ever; they are an inheritance which will continue for ever, Deuteronomy 33:4. These David chose and took, as for his counsellors, so for his portion and inheritance; and a wise and good choice he made; he chose the good part that should never be taken away; his reason for it follows:
for they are the rejoicing of my heart; the doctrines in them, the promises of them, when read or heard explained, gave him a sensible pleasure; revived his heart, and cheered his spirits, supported him under all his troubles, and caused him to go on his way rejoicing; see Jeremiah 15:16.

These he joyfully takes as his perpetual heritage, to perform the duties and receive the comforts they teach, evermore.