Musnad Abu Ya'la al-Mawsili 113:5

'Abd al-A'la narrated to us, Wahib narrated to us, Ayyub narrated to us, from Abu Qilabah, from Anas, who said: The Messenger of Allah (may Allah bless him and grant him peace) used to visit Umm Sulaym and take a midday nap at her place. He was prone to heavy sweating, so she would collect it in glass bottles. And he used to pray upon the khumrah (a small prayer mat made of palm leaves).