Salman Abu Hazam al-Ashja'i سلمان أبو حازم الأشجعي · The Book of Purification

Your Apostle (ﷺ) teaches you about everything, even about excrement. He replied: Yes, he has forbidden us to face the Qibla at the time of excretion or urination, or cleansing with right hand or with less than three pebbles, or with dung or bone.

I see that your friend even teaches you about the excrement. He replied; Yes, he has in fact forbidden us that anyone amongst us should cleanse himself with his right hand, or face the Qibla. He has forbidden the use of dung or bone for it, and he has also instructed us not to use less than three pebbles (for this purpose).

"I was behind Abu Hurairah when he performed Wudu' for Salah. He washed his hand up to the armpit, and I said: 'O Abu Hurairah! What is this Wudu'?' He said to me: 'O Banu Farrukh! You are here! If I had known that you were here I would not have performed Wudu' like this. I heard my close friend (i.e., the Prophet (ﷺ)) says: "The jewelry of the believer will reach as far as his Wudu reached."