Exodus 22:9

22:9 In all cases of illegal possessions, whether for an ox, a donkey, a sheep, a garment, or any kind of lost item, about which someone says ‘This belongs to me,’ the matter of the two of them will come before the judges, and the one whom the judges declare guilty must repay double to his neighbor.

Exodus 32:27

32:27 and he said to them, “Thus says the Lord, the God of Israel, ‘Each man fasten his sword on his side, and go back and forth from entrance to entrance throughout the camp, and each one kill his brother, his friend, and his neighbor.’”