Abdul 'Aziz bin Muhammad al-Daruradi عبد العزيز بن محمد الدراوردي · The Book on Purification

the Prophet said: "Protect the heels from the Fire!"

"For that is the Ribat, that is the Ribat, that is the Ribat" three times.

Allah's Messenger said: "When one of you is in the Masjid, and he senses wind between his buttocks then he should not exit until he hears a sound or smells an odor."