'Ground' in the Bible

And the Lord said to him, Loose the sandal of thy feet, for the place on which thou standest is holy ground.

And I fell to the ground, and heard a voice saying to me, Saul, Saul, why persecutest thou me?

And, when we were all fallen to the ground, I heard a voice saying to me in the Hebrew tongue, Saul, Saul, why persecutest thou me? it is hard for thee to kick against goads.