Deuteronomy 22:2

וְאִם־לֹ֨א קָר֥וֹב אָחִ֛יךָ אֵלֶ֖יךָ וְלֹ֣א יְדַעְתּ֑וֹ וַאֲסַפְתּוֹ֙ אֶל־תּ֣וֹךְ בֵּיתֶ֔ךָ וְהָיָ֣ה עִמְּךָ֗ עַ֣ד דְּרֹ֤שׁ אָחִ֙יךָ֙ אֹת֔וֹ וַהֲשֵׁבֹת֖וֹ לֽוֹ׃

ἐὰν δὲ μὴ ἐγγίζῃ ὁ ἀδελφός σου πρὸς σὲ μηδὲ ἐπίστῃ αὐτόν, συνάξεις αὐτὸν ἔνδον εἰς τὴν οἰκίαν σου, καὶ ἔσται μετὰ σοῦ ἕως ἂν ζητήσῃ αὐτὰ ὁ ἀδελφός σου, καὶ ἀποδώσεις αὐτῷ.

Greek text from Swete's edition, CC BY-SA 4.0

Y si tu hermano no fuere tu vecino, ó no le conocieres, los recogerás en tu casa, y estarán contigo hasta que tu hermano los busque, y se los devolverás.

If your brother does not live near you, or if you do not know who he is, you are to take the animal home to remain with you until your brother comes seeking it; then you can return it to him.