Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
tirmidhi:588 – Maḥmūd b. Ghaylān > Wakīʿ > ʿAbdullāh b. Saʿīd b. Abū Hind > Baʿḍ Aṣḥāb ʿIkrimah

"The Prophet would glance during Salat" and he mentioned a similar narration.  

الترمذي:٥٨٨ – حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ حَدَّثَنَا وَكِيعٌ عَنْ عَبْدِ اللَّهِ بْنِ سَعِيدِ بْنِ أَبِي هِنْدٍ عَنْ بَعْضِ أَصْحَابِ عِكْرِمَةَ

أَنَّ النَّبِيَّ ﷺ كَانَ يَلْحَظُ فِي الصَّلاَةِ فَذَكَرَ نَحْوَهُ قَالَ وَفِي الْبَابِ عَنْ أَنَسٍ وَعَائِشَةَ