Musannaf Ibn Abi Shayba 33:1231

Fudayl ibn 'Iyad narrated to us, from Mansur, from Mujahid, regarding the saying: "Houris confined in pavilions" (55:72). He said: They are confined in their hearts, their gazes, and their selves to their husbands, in pavilions of pearl, not desiring anyone other than them.