Adam Clarke on Deuteronomy 22:1

Thou shalt not see thy brother's ox or his sheep go astray - The same humane, merciful, and wise regulations which we met with before, Exo 23:4, Exo 23:5, well calculated to keep in remembrance the second grand branch of the law of God, Thou shalt love thy neighbor as thyself. A humane man cannot bear to see even an ass fall under his burden, and not endeavor to relieve him; and a man who loves his neighbor as himself cannot see his property in danger without endeavoring to preserve it. These comparatively small matters were tests and proofs of matters great in themselves, and in their consequences. See the note on Exo 23:4.