مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 998
Prayer
What may not be done during Prayer and what is permitted - Section 2
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.
Mishkat al-Masabih, 998صَحِيحٌ (الألباني)