John Gill Commentary Daniel 10:15

"and when he had spoken unto me according to these words, I set my face toward the ground, and was dumb." — Daniel 10:15 (ASV)

And when he had spoken such words unto me
As before related, concerning the contest between him and the prince of Persia; and especially concerning what would befall the people of the Jews in the latter day:

I set my face toward the ground ;
not being able to look up; his eyes were fixed upon the earth like one confounded and thunderstruck, filled with amazement and wonder:

and I became dumb ;
not able to speak a word, as is the case of persons sometimes in surprise, or through excess of any of the passions: this arose either from the majesty of the angel; or rather from the nature and importance of the things he said; or from a consciousness of his own impurity, and so of his unworthiness to converse with so exalted a creature, and to be favoured with such secrets.

The Arabic version is, "and I supplicated"; very wrongly.