lt was narrated that Abul Hasan, the freed slave of Banu Nawfal, said:
"Ibn 'Abbas was asked about a slave who divorces his wife twice, then (they are freed). Can he marry her? He said: 'Yes.' It was said to him: 'On what basis?' He said: 'The Messenger of Allah (ﷺ) passed such a judgement .' " (D a' if) (IT)
English reference (IT): Vol. 3, Book 10, Hadith 2082 (IT)
Arabic reference (IT): Book 10, Hadith 2160 (IT)