John Gill Commentary Deuteronomy 24:18

"but thou shalt remember that thou wast a bondman in Egypt, and Jehovah thy God redeemed thee thence: therefore I command thee to do this thing." — Deuteronomy 24:18 (ASV)

But you shall remember that you were a bondman in Egypt ,
&c.] The remembrance of which may cause sympathy with persons in distress; particularly the stranger, the fatherless, and the widow:

and the Lord your God redeemed you from there ;
the Targum of Jonathan, "the Word of the Lord your God;" which, as it was an act of great kindness and mercy in God to them, taught them, and laid them under obligation to show favour to their fellow creatures in distress:

therefore I command you to do this thing :
not to pervert the judgment of the stranger and fatherless, nor take a widow's raiment for a pledge; and it may be carried further into the context, and respect the laws about the pledge of the poor man, and giving the hired servant his wages in due time.