Musannaf Ibn Abi Shaybah

Ibrahim and Hazrat Sha’bi (may Allah have mercy on them) state regarding the person who, by deception, received a child born of adultery. If he set him free and later found out that he was a child born of adultery, they replied that the emancipation will take effect, and the one who committed the deception will bear the cost from his wealth, and the right of allegiance (wala’) will belong to him.