The Messenger of Allah ﷺ said to me, "Ali, I love for you what I love for myself, and I dislike for you what I dislike for myself. Do not recite the Quran while bowing, nor while prostrating. Do not pray with your hair tied up, for it is the seat of Satan. Do not sit back on your heels between the two prostrations. Do not fidget with the pebbles. Do not spread your forearms on the ground in prostration. Do not prompt the imam during prayer. Do not wear gold rings. Do not wear silk garments woven with cotton. And do not ride on saddle cushions of silk."
حدثنا يزيد أنبأنا إسرائيل بن يونس حدثنا أبو إسحاق عن الحارث
قال لي رسول الله ﷺ يا علي إني أحب لك ما أحب لنفسي وأكره لك ما أكره لنفسي لا تقرأ وأنت راكع ولا وأنت ساجد ولا تصل وأنت عاقص شعرك فإنه كفل الشيطان ولا تقع بين السجدتين ولا تعبث بالحصى ولا تفترش ذراعيك ولا تفتح على الإمام ولا تتختم بالذهب ولا تلبس القسي ولا تركب على المياثر
Its isnad is daif due to Harith. See 1044, 1162."Aqs al-shar" means twisting the hair and tucking its ends into its roots, similar to braiding."Kifl al-shaytan" means the seat of the devil, and it is pronounced with a kasrah on the kaf and a sakin on the fa.