'Ground' in the Bible

Are not two sparrows sold for a cent? And yet not one of them will fall to the ground apart from your Father.

And He directed the people to sit down on the ground;

But he who received the one talent went away, and dug a hole in the ground and hid his master’s money.

And I was afraid, and went away and hid your talent in the ground. See, you have what is yours.’