Sunan Ibn Majah Book 5, Hadith 165

It was narrated from Ka’b bin ‘Ujrah that the Messenger of Allah (ﷺ) saw a man who had interlocked his fingers during the prayer, so the Messenger of Allah (ﷺ) separated his fingers.

Previous Hadith

“The Messenger of Allah (ﷺ) forbade a man to cover his mouth during the prayer.”

Sunan Ibn Majah Book 5, Hadith 164
Next Hadith

“When anyone of you yawns, let him put his hand over his mouth and not make a sound, because Satan laughs at him.”

Sunan Ibn Majah Book 5, Hadith 166