It is narrated from Sayyiduna Zayd bin Arqam (may Allah be pleased with him); he said: The Messenger of Allah (peace and blessings be upon him) sent Sayyiduna Mu'adh (may Allah be pleased with him) to Syria. When he returned, he said: "O Messenger of Allah, I saw the People of the Book prostrating to their bishops and patriarchs; should we not prostrate to you?" He said: "If I were to command anyone to prostrate to anyone, I would command the woman to prostrate to her husband. And a woman does not fulfil the right of her husband until, even if he asks her for intimacy on the back of a camel's saddle, she gives herself to him."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 5098