Hadith.4550 - Muhammad ibn Abi Umayr narrated from Ishaq ibn Ammar, who said: I asked Abu al-Hasan (as) about a man who purchased a pregnant slave whose pregnancy was evident and had relations with her. Imam (as) said: "What he did was a reprehensible act." I said: "What is your ruling in this matter?" Imam (as) said: "Did he practice withdrawal (coitus interruptus) or not?" I said: "Please explain the ruling in both cases." Imam (as) said: "If he practiced withdrawal, then he must fear Allah (swt) and never repeat this action. But if he did not practice withdrawal, he must not sell the child, nor consider the child an inheritor. Instead, he must emancipate the child and allocate some of his wealth to provide for the child's living expenses, because he has nourished the child with his own seed."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.