We asked Ibn Abbas about sitting on one's buttocks (in prayer). (ala alqad mein) He said: It is sunnah. We said to him: We find it a sort of cruelty to the foot. Ibn 'Abbas said: It is the sunnah of your Apostle (ﷺ).
Reference: Sahih Muslim 536 In-book : Book 5, Hadith 38 USC-MSA web (English) : Book 4, Hadith 1093 (deprecated)
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