Al-Kāfi - Volume 3 > Placing the Forehead on the Ground
Hadith #8

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, ‘Alayhi al-Salam, ’Can one blow at the place where he places his forehead for prostration? 5 He (the Imam) replied, ’No, he cannot do so.”