Riyad-us-Saliheen 285
Abu Hurairah (May Allah be pleased with him) reported: The Prophet (PBUH) said, "If I were to order anyone to prostrate himself before another, I would have ordered a woman to prostrate herself before her husband".
[At-Tirmidhi]
This Hadith also shows the unique importance of the wife's obedience to her husband within her capacity and as long as he does not order her to disobey Allah.