It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) used to visit Sayyida Umm Sulaym (may Allah be pleased with her) and would sleep on her bed. Sometimes it would happen that she was not present at her home. One day, when she came home, she was told that the Noble Prophet (peace and blessings be upon him) was sleeping on her bed, and it was the season of heat. The Noble Prophet (peace and blessings be upon him) perspired so much that his sweat was falling onto a piece of leather on the bed. Sayyida Umm Sulaym (may Allah be pleased with her) says: I began to collect his sweat by squeezing it into a bottle. While I was doing this, the Prophet (peace and blessings be upon him) woke up and said: "Umm Sulaym, what are you doing?" I replied: "O Messenger of Allah! We want to use it as a blessing for our children." The Prophet (peace and blessings be upon him) said: "You are doing right."