Deuteronomy 22:3
You should do the same with his donkey and his garment. You should do likewise with anything lost by your brother found by you. Do not ignore it.
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 see your enemy's cow or donkey running loose, take it back to him.