‏النكاح : Hadeeth No:3334 Anas b. Malik (Allaah be pleased with him) reported: I was the best informed among the people pertaining to Hijab (veil and seclusion). Ubayy b. Ka'b used to ask me about it. Anas (Allaah be pleased with him) thus narrated: The Messenger of Allaah (sallAllaahu alayhi wa sallam) got up in the morning...

‏الطهارة : Hadeeth No:492 This hadith is reported from Hudaifa by another chain of transmitters. Whenever he (the Prophet) got up in the night, they (the transmitters) have not mentioned the words: for offering Tahajjud prayer....