2 Samuel 15:20 - Matthew Poole's English Annotations on the Holy Bible

Thou camest but yesterday; by which it may be gathered that these were not the Israelitish soldiers which went with David to Gath, and came up with him from thence to Hebron, which was above thirty years before this time, but some proselytes which came from thence more lately. For though this word yesterday be sometimes used of a time long before past, as @2Ki 9:26 Job 8:9 Isaiah 30:33; yet it seems to be here restrained to a shorter compass by the following words, and by the argument here used. Go whither I may; I know not whither; having now no certain dwelling-place. Thy brethren; thy countrymen and soldiers the Gittites, 2 Samuel 15:18. Mercy and truth be with thee; since I am now unable to recompense thy kindness and fidelity to me, my hearty prayer to God is, that he would show to thee his mercy, in blessing thee with all sorts of blessings, and his faithfulness, in making good all those promises which he hath made, not to Israelites only, but in and with them to all true-hearted proselytes, such as thou art.