Suhayl bin Abi Salah سهيل بن أبي صالح · The Book on Purification

Allah's Messenger said: "When a Muslim, or believer, performs Wudu', washing his face, every evil that he looked at with his eyes leaves with the water - or with the last drop of water, or an expression similar to that - and when he washes his hands, every evil he did with his hands leaves with the water - or with the last drop of water - until he becomes free of sin."

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

Allah's Messenger said: "There no Wudu except for a sound or a smell."

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."