It is narrated from Abu Hasan that he asked Sayyiduna Abdullah bin Abbas (may Allah be pleased with them) about a slave whose wife is also a slave woman; he gives his wife two divorces, then both of them are set free. Is it permissible for him to send her a proposal for marriage now? Sayyiduna Abdullah bin Abbas (may Allah be pleased with them) replied: Yes, this is the decision that the Noble Prophet (peace and blessings be upon him) made.

(Second chain) It is narrated from Abu Hasan that Sayyiduna Abdullah bin Abbas (may Allah be pleased with them) was asked about a slave who had given his wife two divorces, then both of them became free, so can he marry that slave woman again? He replied: Yes. Someone asked: From whom are you narrating this? He said: The Noble Prophet (peace and blessings be upon him) gave this very verdict. Abdullah bin Ahmad says: My father, Imam Ahmad (may Allah have mercy on him), said: Ma'mar was asked: Who is this Abu Hasan? He has lifted a very heavy rock (i.e., he has said something baseless).