بُلُوغُ الْمَرَامِ
Bulugh al-Maram 292
The Book of Prayer
وَعَنْ حُذَيْفَةَ - رضى الله عنه - قَالَ : { صَلَّيْتُ مَعَ اَلنَّبِيِّ - صلى الله عليه وسلم -فَمَا مَرَّتْ بِهِ آيَةُ رَحْمَةٍ إِلَّا وَقَفَ عِنْدَهَا يَسْأَلُ, وَلَا آيَةُ عَذَابٍ إِلَّا تَعَوَّذَ مِنْهَا } أَخْرَجَهُ اَلْخَمْسَةُ , وَحَسَّنَهُ اَلتِّرْمِذِيُّ [1]
Narrated Hudhaifah (RA): I prayed with the Prophet (ﷺ) and (noticed that) whenever he came to a verse which spoke of mercy, he stopped and made supplication, and whenever he came to a verse which spoke of punishment, he stopped and sought refuge in Allah against it." [Reported by Al-Khamsah, and at-Tirmidhi graded it Hasan (good)].
Sunnah.com reference: Book 2, Hadith 178