It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) used to take a midday nap at the house of Sayyida Umm Sulaym (may Allah be pleased with her), and he would perspire profusely. Sayyida Umm Sulaym (may Allah be pleased with her) prepared a leather mat for him, upon which he would take his nap. Sayyida Umm Sulaym (may Allah be pleased with her) had made a line between his feet. She would collect his sweat by squeezing it. The Prophet (peace and blessings be upon him) asked, "Umm Sulaym (may Allah be pleased with her)! What are you doing?" She replied, "O Messenger of Allah! This is your sweat; I will mix it with my perfume." So the Prophet (peace and blessings be upon him) made the best supplication for her.