Al-Kāfi

Hadith 1265
prayer-etiquette
8ـ مُحَمَّدٌ عَنِ الْفَضْلِ عَنْ حَمَّادِ بْنِ عِيسَى عَنْ حَرِيزٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ قُلْتُ لَهُ الرَّجُلُ يَنْفُخُ فِي الصَّلاَةِ مَوْضِعَ جَبْهَتِهِ فَقَالَ لاَ.
8. Muhammad has narrated from al-Fadl from Hammad ibn ‘Isa from Hariz from Muhammad ibn Muslim who has said the following: “I once asked abu ’Abd Allah (a.s.), ’Can one blow at the place where he places his forehead for prostration? 5 He (the Imam) replied, ’No, he cannot do so.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī