'Backs' in the Bible

Who say to a tree, You are my father; and to a stone, You have given me life: for their backs have been turned to me, not their faces: but in the time of their trouble they will say, Up! and be our saviour.

And they have been turning their backs and not their faces to me: and though I was their teacher, getting up early and teaching them, their ears were not open to teaching.