Al-Ahzab 33:37

Wa-ith taqoolu lillatheeanAAama Allahu AAalayhi waanAAamta AAalayhi amsik AAalaykazawjaka wattaqi Allaha watukhfee fee nafsika maAllahu mubdeehi watakhsha annasa wallahuahaqqu an takhshahu falamma qadazaydun minha wataran zawwajnakahalikay la yakoona AAala almu/mineena harajunfee azwaji adAAiya-ihim itha qadawminhunna wataran wakana amru Allahi mafAAoola

And [remember, O Muḥammad], when you said to the one on whom Allāh bestowed favor and you bestowed favor, "Keep your wife and fear Allāh," while you concealed within yourself that which Allāh is to disclose. And you feared the people, while Allāh has more right that you fear Him. So when Zayd had no longer any need for her, We married her to you in order that there not be upon the believers any discomfort [i.e., guilt] concerning the wives of their claimed [i.e., adopted] sons when they no longer have need of them. And ever is the command [i.e., decree] of Allāh accomplished.

(Remember) when you (O Prophet,) were saying to the one who was favored by Allah and favored by you, “Keep your wife to your self, and fear Allah.” And you were concealing in your heart what Allah was going to reveal, and you were fearing people, while Allah is more entitled to be feared by you. So, when Zaid finished his desire for her, We gave her into your marriage, so that there may not be a problem for the believers in marrying wives of their adopted sons, when they finish their desire for them; and Allah’s decree had to be enforced.