Jabir · The Book of Purification

When anyone wipes himself with pebbles (after answering the call of nature) he should do this odd number of times.

'Umar b. Khattab said that a person performed ablution and left a small part equal to the space of a nail (unwashed). The Apostle of Allah (ﷺ) saw that and said: Go back and perform ablution well. He then went back (performed ablution well) and offered the prayer.

The Messenger of Allah (ﷺ) forbade the use of bone or the droppings of camels for wiping (after excretion).

The Messenger of Allah (ﷺ) forbade to urinate in stagnant water.