Ibrahim said that Sayyiduna Ali (may Allah be pleased with him) said: If he were brought to me, I would stone him. Al-Adani said: Meaning the man who had intercourse with his wife's slave-girl.
The Shaykh said: By "Ibn Umm Abd" Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) is meant, and saying that he does not know what happened afterwards is evidence of its abrogation and a refutation of the fatwa he gave.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحدود / 17079