How he sware unto the Lord, [and] vowed unto the mighty [God] of Jacob. Whom Jacob called so, Genesis 49:24; and to whom he vowed a vow, and is the first we read of that did make one, and it was concerning the house of God, Genesis 28:17; and who had an experience of the might and power of God in protecting and defending him from his brother Esau: of this oath and vow of David no mention is made elsewhere, but no doubt they were made; see Psalms 119:106; of the Messiah's swearing, though upon another account, to whom this may be applied, see Isaiah 45:23.
Related Commentaries of Psalms 132:2
Psalms 132:2
2 How he sware unto the LORD, and vowed unto the mighty God of Jacob;