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
quran:15:8 –

We do not send down the angels except with truth; and the disbelievers would not then be reprieved.  

God, exalted be He, says: The angels do not descend (tanazzalu: one of the two tā’ letters ˹of tatanazzalu˺ has been omitted) save with the truth, with the chastisement; and then, that is, upon the descent of the angels with the chastisement, they ˹the disbelievers˺ would not be reprieved, ˹would not˺ be granted respite.
القرآن:١٥:٨ –

مَا نُنَزِّلُ الْمَلَائِكَةَ إِلَّا بِالْحَقِّ وَمَا كَانُوا إِذًا مُنْظَرِينَ  

قال تعالى {ما تَنَزَّلُ} فيه حذف إحدى التاءين {الملائكة إلا بالحق} بالعذاب {وما كانوا إذاً} أي حين نزول الملائكة بالعذاب {منظرين} مؤخرين.