Jami` at-Tirmidhi, Volume 1, Book 4, Hadith 588 (DarusSalam) ⓘ
Sa'eed bin Abi Hind narrated from some of the companions of Ikrimah: "The Prophet would glance during Salat" and he mentioned a similar narration.
حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ، حَدَّثَنَا وَكِيعٌ، عَنْ عَبْدِ اللَّهِ بْنِ سَعِيدِ بْنِ أَبِي هِنْدٍ، عَنْ بَعْضِ، أَصْحَابِ عِكْرِمَةَ أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يَلْحَظُ فِي الصَّلاَةِ . فَذَكَرَ نَحْوَهُ . قَالَ وَفِي الْبَابِ عَنْ أَنَسٍ وَعَائِشَةَ .
also referenced under: Hadith 588 (Reference) & Book 6, Hadith 45 (In-Book)