Prayer: Disapproved Acts During Sajdah
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1078
It is disapproved to recite the Qur’an while in sajdah. Furthermore, it is disapproved to blow on the place of sajdah to remove dust from it; and if, as a result of blowing, two words intentionally come out of one’s mouth, then based on obligatory precaution, the prayer is invalid.
Apart from these instances, there are other disapproved acts mentioned in more detailed books.