אֲבֵדָה

In all cases of illegal possession of an ox, a donkey, a sheep, a garment, or any lost item that someone claims, ‘This is mine,’ both parties shall bring their cases before the judges. The one whom the judges find guilty must pay back double to his neighbor.

…or finds lost property and lies about it and swears falsely, or if he commits any such sin that a man might commit—

…once he has sinned and becomes guilty, he must return what he has stolen or taken by extortion, or the deposit entrusted to him, or the lost property he found,

And you shall do the same for his donkey, his cloak, or anything your brother has lost and you have found. You must not ignore it.