Sa'id ibn Ziyad ibn Subayh al-Hanafi said: I prayed by the side of Ibn Umar and I put my hands on my waist. When he finished his prayer, He said: This is a cross in prayer; the Messenger of Allah (ﷺ) used to forbid it.
Reference: Sunan Abi Dawud 903 In-book : Book 2, Hadith 513 English translation : Book 3, Hadith 902
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