Mishkat al-Masabih #939
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا قَالَ: إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يَلْحَظُ فِي الصَّلَاةِ يَمِينًا وَشِمَالًا وَلَا يَلْوِي عُنُقَهُ خَلْفَ ظَهْرِهِ. رَوَاهُ التِّرْمِذِيُّ وَالنَّسَائِيُّ
Ibn ‘Abbas said that God’s Messenger used to glance right and left during prayer but did not turn his neck to look behind him.
Tirmidhi and Nasa’i transmitted it.
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About Mishkat al-Masabih
This hadith is #939 from Mishkat al-Masabih, in the Book of Prayer.