The Prophet ﷺ used to enter the house of Umm Sulaym and sleep on her bed when she was not there. One day he came and slept on her bed, and someone came and told her, "The Prophet ﷺ is sleeping in your house on your bed."She came, and he had been sweating, and his sweat had collected on a piece of leather on the bed. She opened her container and began to soak up that sweat, squeezing it into her bottles.The Prophet ﷺ woke up startled and asked, "What are you doing, Umm Sulaym?"She replied, "Messenger of Allah, we hope for its blessing for our children."He said, "You have done well."
كان النبي ﷺ يدخل بيت أم سليم، فينام على فراشها وليست فيه قال: فجاء ذات يوم فنام على فراشها، فأتيت فقيل لها: هذا النبي ﷺ نام في بيتك على فراشك. قال: فجاءت وقد عرق، واستنقع عرقه على قطعة أديم على الفراش، ففتحت عتيدتها، فجعلت تنشف ذلك العرق فتعصره في قواريرها، ففزع النبي ﷺ فقال: ما تصنعين يا أم سليم؟ فقالت: يا رسول الله نرجو بركته لصبياننا. قال: أصبت.
Muslim narrated it in the Book of Virtues (2331:84) from Muhammad bin Rafi, who said, Hujayn bin Muthanna narrated to us, who said, Abdul-Aziz (that is, the son of Abu Salama) narrated to us, from Ishaq bin Abdullah bin Abu Talha, from Anas bin Malik, and he related it.