Deuteronomy 22:3

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.

Cross-references

In Deuteronomy 22:1, the same command applies specifically to livestock—Deut 22:3 extends it to all lost property.