I saw a man performing the greeting of the mosque while placing the mushaf on the floor of the mosque. Is that permissible?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: I was in the mosque on Friday and saw a person performing the greeting of the mosque while placing the mushaf on the floor of the mosque. So I said, this action is not befitting. He said, "Bring your evidence for the impermissibility of this action." The question is: Is what I said correct? And what is the evidence for it?

Answer:
If the mushaf is on a mat on its prayer rug, there is nothing wrong with it. But if he places it on the ground, it is not permissible, because that is a desecration of the mushaf. If he places it on the ground, it is a desecration. But if he places it on his prayer rug or on a mat he prays on, there is nothing wrong with that. And Allah the Exalted knows best, and may Allah send prayers and peace upon our Prophet Muhammad and upon his family and his Companions.