Musannaf Ibn Abi Shayba 7:396

'Abd al-Samad ibn 'Abd al-Warith narrated to us, from Yazid ibn Abi Jarir, from Maryam bint Abi Yazid, from Umm Yahith, that she asked Abu Umamah about the child of zina (adultery/fornication): "Should I emancipate him?" He said: "He is like a counterfeit dirham; give him away in charity."