Abdul 'Aziz bin Muhammad al-Daruradi عبد العزيز بن محمد الدراوردي · The Chapters on Divorce

"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)

"Do not corrupt the Sunnah of our Prophet Muhammad (ﷺ). The waiting period of an Umm Walad is four months and ten (days)."