Sayyiduna Ibn Abbas (may Allah be pleased with them both), regarding the saying of Allah Almighty: "O Prophet, why do you forbid what Allah has made lawful for you?" [Al-Tahrim: 1], said: "He (peace and blessings be upon him) had made his slave-woman unlawful for himself."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11084