Qatadah (may Allah have mercy on him) said concerning the verse "And when you said to the one on whom Allah had bestowed favour and on whom you had bestowed favour" [al-Ahzab: 37]: "Allah favoured him with Islam, and the Prophet (peace and blessings be upon him) favoured him by freeing him." Concerning "Keep your wife to yourself" [al-Ahzab: 37], Qatadah said: Zayd (may Allah be pleased with him) came to the Prophet (peace and blessings be upon him) and said: Zaynab's tongue has become harsh towards me, and I want to divorce her. The Prophet (peace and blessings be upon him) said: "Fear Allah and keep your wife to yourself." Yet the Prophet (peace and blessings be upon him) wished in his heart that he would divorce her, and he (peace and blessings be upon him) feared what people would say if he (peace and blessings be upon him) ordered him to divorce her. So Allah revealed: "And you concealed within yourself what Allah was to disclose, and you feared the people, while Allah has more right that you fear Him. So when Zayd had accomplished his need of her" - that is, when Zayd divorced her - "We married her to you." [al-Ahzab: 37]
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20484