Narrated Abu Huraira: Allah's Apostle said, "Were I not afraid that it would be hard on my followers, I would order them to use the siwak (as obligatory, for cleaning the teeth).

Narrated Abu Huraira: Allah's Apostle said, "If I had not found it hard for my followers or the people, I would have ordered them to clean their teeth with Siwak for every prayer."

Narrated Anas: Allah's Apostle said, "I have told you repeatedly to use the Siwak. (The Prophet put emphasis on the use of the Siwak.)

Narrated 'Ata: One night the Prophet delayed the `Isha' prayer whereupon `Umar went to him and said, "The prayer, O Allah's Apostle! The women and children had slept." The Prophet came out with water dropping from his head, and said, "Were I not afraid that it would be hard for my followers (or for the people), I would order them to pray `Isha prayer at this time." (Various versions of this Hadith are given by the narrators with slight differences in expression but not in content).