When Moses heard this, he fell flat on his face:

Numbers 16:45 Get you out from the midst of this multitude, this moment will I destroy them. And as they were lying on the ground,

Numbers 14:5 And when Moses and Aaron heard this, they fell down flat upon the ground before the multitude of the children of Israel.

Numbers 20:6 And Moses and Aaron leaving the multitude, went into the tabernacle of the covenant, and fell flat upon the ground, and cried to the Lord, and said. O Lord God, hear the cry of this people, and open to them thy treasure, a fountain of living water, that being satisfied, they may cease to murmur. And the glory of the Lord appeared over them.

Joshua 7:6 But Joshua rent his garments, and fell flat on the ground, before the ark of the Lord, until the evening, both he and all the ancients of Israel: and they put dust upon their heads.