This refers to four years after he returned to Jerusalem. AT: "fours years after Absalom had returned to Jerusalem, he" (See: [[rc://en/ta/man/translate/figs-explicit]])
# and pay a vow that I have made to Yahweh in Hebron
"to Hebron and there fulfill a vow that I have made to Yahweh"
# For your servant
Here Absalom refers to himself this way to honor the king.