Sahih Muslim Book 4, Hadith Number 1673.

Chapter : Encouragement to observe prayers during Ramadhan and that is Tarawih.

Makhrama b. Sulaiman narrated it with the same chain of narrators and he made this addition: “He then went to the water-skin and brushed his teeth and performed ablution well. He did not pour water but a little. He then awakened me and I stood up,” and the rest of the Hadith is the same.