Al-Kāfi

Hadith 114
night-prayerangels
7ـ عَلِيُّ بْنُ مُحَمَّدِ بْنِ بُنْدَارَ عَنْ إِبْرَاهِيمَ بْنِ إِسْحَاقَ الأحْمَرِ عَنْ عَبْدِ الله بْنِ حَمَّادٍ عَنْ أَبِي بَكْرِ بْنِ أَبِي سَمَّاكٍ قَالَ قَالَ أَبُو عَبْدِ الله (عَلَيْهِ الْسَّلام) إِذَا قُمْتَ بِاللَّيْلِ فَاسْتَكْ فَإِنَّ الْمَلَكَ يَأْتِيكَ فَيَضَعُ فَاهُ عَلَى فِيكَ وَلَيْسَ مِنْ حَرْفٍ تَتْلُوهُ وَتَنْطِقُ بِهِ إِلاَّ صَعِدَ بِهِ إِلَى السَّمَاءِ فَلْيَكُنْ فُوكَ طَيِّبَ الرِّيحِ.
7. Ali ibn Muhammad ibn Bundar has narrated from Ibrahim ibn Ishaq al-Ahmar from ‘Abd Allah ibn Hammad from abu Bakr ibn abu Sammak who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘When you wake up during the night (for Salah (prayer)) you should brush your teeth; the angel comes and places his mouth over your mouth. Every word you say, he climbs with it to the heaven. Your mouth should have a pleasant smell.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī