Ibn "Umar saw a man resting on his left hand while he was sitting during prayer. The version of Harun b. Zaid goes: He was lying on his left side. the agreed version goes: he said to him: Do not sit like this, because those who are punished sit like this.
Reference: Sunan Abi Dawud 994 In-book : Book 2, Hadith 605 English translation : Book 2, Hadith 989
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