Sahih Muslim Book 8, Hadith Number 3453.

Chapter: Permissibility of bestowing the turn on one’s fellow-wife.

‘Aisha (Allah be pleased with her) reported: I felt jealous of the women who offered themselves to Allah’s Messenger(May peace be upon him) and said: Then when Allah, the Exalted and Glorious, revealed this: “You may defer any one of them you wish, and take to yourself any you wish; and if you desire any you have set aside (no sin is chargeable to you)” (xxxiii. 51), I (‘Aisha.) said: It seems to me that your Lord hastens to satisfy your desire.