Mishkat al-Masabih #747
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن سهل بن سعد قَالَ: كَانَ النَّاسُ يُؤْمَرُونَ أَنْ يَضَعَ الرَّجُلُ الْيَدَ الْيُمْنَى عَلَى ذِرَاعِهِ الْيُسْرَى فِي الصَّلَاةِ. رَوَاهُ البُخَارِيّ
Sahl b. Sa'd said that the people received command that a man should place the right hand on the left forearm in prayer.
Bukhari transmitted it.
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About Mishkat al-Masabih
This hadith is #747 from Mishkat al-Masabih, in the Book of Prayer.