Sahih Muslim Book 8, Hadith Number 3454.

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

Hisham reported on the authority of his father that ‘Aisha (Allah be pleased with her) used to say: Does the woman not feel shy of offering herself to a man? Then Allah the Exalted and Glorious revealed this verse: “You may defer any of them you wish and take to yourself any you wish.” I (‘Aisha said): It seems to me that your Lord hastens to satisfy your desire.