Romans 9:15 Kjv,asv

Exodus 33:19 NIV
And the Lord said, “I will cause all my goodness to pass in front of you, and I will proclaim my name, the Lord, in your presence. I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion.

Romans 9:18-19 NIV
Therefore God has mercy on whom he wants to have mercy, and he hardens whom he wants to harden. One of you will say to me: “Then why does God still blame us? For who is able to resist his will?”