Sunan Ibn Majah Book 5, Hadith 162
“It is impolite for a man to wipe his forehead a great deal
before
he finishes prayer.”
“The Messenger of Allah (ﷺ) said: ‘Do not bow or prostrate before me. No matter how far ahead of you I bow, you will catch up with me when I stand up, and no matter how far ahead of you I prostrate, you will catch up with me when I raise my head. I have become bulky.’”
“Do not crack your fingers during the prayer.”