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.
Sunan Ibn Majah Book 5, Hadith 165
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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