Asim al-Ahwal عاصم الأحول · The Book of Purification and its Sunnah

"The Messenger of Allah said: 'Whoever performs ablution, let him clean his nose, and whoever uses pebbles to clean himself after defecating, let him use an odd number.'"

The Messenger of Allah wiped his ears, putting his forefingers in his ears and wiping the back of them with his thumbs, so he wiped them inside and out.

"I was with Salman, and he saw a man removing his leather socks for ablution. Salman said to him" 'Wipe over your leather socks and your head cover, and your forehead, for I saw the Messenger of Allah wiping over his leather socks and head cover.'"

"If the Messenger of Allah wanted to eat when he was sexually impure, he would perform ablution."