Hadith.841 - A man asked Imam Jafar ibn Muhammad Al-Sadiq (as) bout a place with dust where he wanted to blow it away before prostrating.
The Imam said: "There is no issue”.
Al-Kāfi #1265“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,...