At the burning bush, God tells Moses the ground he stands on is what?

'Take off your sandals, for the place where you are standing is holy ground.' Before Moses receives a mission, he is asked to notice where he already stands — ordinary ground made sacred by God's presence.

Exodus 3:5 · BSB

““Do not come any closer,” God said. “Take off your sandals, for the place where you are standing is holy ground.””