2 Samuel 15:8

For thy servant vowed a vow while I abode at Geshur in Syria,.... When at his grandfather's court there:

saying, if the Lord will bring me again indeed to Jerusalem; which he might be sincerely…

While I abode at Geshur in Syria - Geshur, the country of Talmai, was certainly not in Syria, but lay on the south of Canaan, in or near Edom, as is evident from Jdg 1:10; Sa1 27:8; Sa2 13:37. Hence…

We have here the breaking out of Absalom's rebellion, which he had long been contriving. It is said to be after forty years, Sa2 15:7. But whence it is to be dated we are not told; not from David's…

then will I serve theLord] By offering a sacrifice in accordance with his vow. Cp. Jacob's similar vow (Gen 28:20-22).