John Gill Commentary Psalms 132:2

"How he sware unto Jehovah, And vowed unto the Mighty One of Jacob:" — Psalms 132:2 (ASV)

How he swore to the Lord, [and] vowed to 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 28:17Genesis 28:20Genesis 28:21); 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) (Revelation 10:1Revelation 10:2Revelation 10:5Revelation 10:6).