'Fail' in the Bible

There shall not any man be able to stand before thee all the days of thy life. as I was with Moses, so I will be with thee; I will not fail thee, nor forsake thee.

And Joshua said, Hereby ye shall know that the living God is among you, and that he will without fail drive out from before you the Canaanite, and the Hittite, and the Hivite, and the Perizzite, and the Girgashite, and the Amorite, and the Jebusite.

Now therefore ye are cursed, and there shall never fail to be of you bondmen, both hewers of wood and drawers of water for the house of my God.