'A’isha said that once when God’s Messenger was with a number of the Emigrants and Helpers a camel came and prostrated itself before him. Thereupon his companions said, “Messenger of God, beasts and trees prostrate themselves before you, but we have most right to do so.” He replied, “Worship your Lord and honour your brother. If I were to order any one to prostrate himself before another, I would order a woman to prostrate herself before her husband; and if he were to order her to convey stones from a yellow mountain to a black one, or from a black mountain to a white one, it would be incumbent on her to do so.” Ahmad transmitted it.