Matthew Poole's Concise Commentary
Deuteronomy 23:15
This is not to be understood universally, as if all servants that flee from their masters, though without any sufficient cause or colour of justice, might be detained from them by any person to whom they fled for refuge, for this is apparently contrary to all the laws of religion, and justice, and charity, and would open a door to infinite disorders and mischiefs; but it is to be understood,
1. Of the servants of strangers, because it follows, Deuteronomy 23:16, he shall dwell with thee, even among you, which shows that he had dwelt with and belonged to another people.
2. Of such as belonged to the Canaanites, or other neighbouring nations, because if he had lived in remote countries, it is not probable that he would flee so far to avoid his master, or that his master would follow him so far to recover him. And for the Canaanites this sentence was most just, because both they and theirs were all forfeited to God and to Israel, and whatsoever they enjoyed was by special indulgence. And for the other neighbours it may seem just also, partly, because some of them were within the larger limits of the land belonging to Israel by God's grant or deed of gift, Genesis 15:18 Joshua 1:4; partly, because by their hostile carriages they had given Israel a right to much more of theirs than a few servants that might possibly run away from their masters; and especially, because both masters and servants of these and other nations are unquestionably at the dispose of the Lord their Maker and sovereign Ruler.
3. Of such as upon inquiry appear to have been unjustly oppressed by their masters, as is implied by that phrase of his, making an escape, which supposeth a deliverance from danger or vexation. Now it is not strange nor unjust, if the great God, who hates all tyranny, and styles himself the refuge of the oppressed, doth interpose his authority, and help to rescue such persons from their cruel masters, who otherwise would be too strong for them.
4. Of such as came to them out of a desire to embrace the true religion, which possibly his master perceiving endeavoured by force to restrain him from, as it may be probably thought from his choosing and liking to live among the Israelites, expressed Deuteronomy 23:16. Now if this great and supreme Master, to whom all other masters are but servants, and they and theirs are absolutely in his power, shall receive and protect one that gives up himself to his service against the will of the under-master, who in this case rebels against his sovereign Lord, what shadow is there of injustice in the case?