Romans

For he saith to Moses, I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion.

And he said, I will make all my goodness pass before thee, and I will proclaim the name of the Lord before thee; and will be gracious to whom I will be gracious, and will shew mercy on whom I will shew mercy.

For it was of the Lord to harden their hearts, that they should come against Israel in battle, that he might destroy them utterly, and that they might have no favour, but that he might destroy them, as the Lord commanded Moses.

And the Lord said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand: but I will harden his heart, that he shall not let the people go.

So then it is not of him that willeth, nor of him that runneth, but of God that sheweth mercy.