Deuteronomy 22:3
You shall do the same to his donkey, his clothes, or anything else your neighbor has lost and you have found; you must not refuse to get involved.
Treasury of Scripture Knowledge
Summary
In like manner shalt thou do with his ass; and so shalt thou do with his raiment; and with all lost thing of thy brother's, which he hath lost, and thou hast found, shalt thou do likewise: thou mayest not hide thyself.
General references
Bible References
General references
Exodus 23:4
"If you encounter your enemy's ox or donkey wandering off, you must by all means return it to him.