Musannaf Ibn Abi Shayba 9:1676

Abu Bakr narrated to us, he said: Abd al-A’la narrated to us, from Sa’id, from Qatadah, from al-Hasan—and it is the statement of Qatadah—regarding His saying: "If they are married" (idha ahsanna): He said: If their husbands have married them.