John Gill's Bible Commentary Ver. 7. So Ahaz sent messengers to Tiglathpileser king of Assyria , etc.] Of whom (see 2 Kings 15:29) saying, [I am] thy servant, and thy son ; signifying, that he would be his vassal, and become tributary to him, and serve him as a servant to his master, or a son his father, on condition he would come to his assistance, and so he became his servant; hence his son Hezekiah is said to rebel against the king of Assyria, ( 2 Kings 18:1,7) come up and save me out of the hand of the king of Syria, and out of the hand of the king off Israel, which rise up against me ; which assistance he had no reason to call in, since the Lord had promised him deliverance from both those kings, and gave him a sign of it, ( Isaiah 7:4-16).
Matthew Henry Commentary
Verses 1-9 - Few and evil were the days of Ahaz. Those whose hearts condemn them will go any where in a day of distress, rather than to God. The sin wa its own punishment. It is common for those who bring themselves int straits by one sin, to try to help themselves out by another.
Original Hebrew וישׁלח7971 אחז271 מלאכים4397 אל413 תגלת פלסר8407 מלך4428 אשׁור804 לאמר559 עבדך5650 ובנך1121 אני589 עלה5927 והושׁעני3467 מכף3709 מלך4428 ארם758 ומכף3709 מלך4428 ישׂראל3478 הקומים6965 עלי׃5921