Scripture teaches us by means of natural fellowship to treat the object found as a trust and not to hold hatred of an enemy.
Source: The Stromata Book 2
Deuteronomy 22:1
1 Thou shalt not see the brother's ox or his sheep go astray, and hide thyself from them: thou shalt in any case bring them again unto thy brother.
Commentaries
So says Deuteronomy. But in Exodus, even if someone finds what belongs to his enemy, not just his brother, it says, "Turn and take them back to their owner's house."
Source: CANONICAL EPISTLE 4