Bible Verses About The Mercy of God: To whom he will

I will sow her for me in the land. I will have pity on Lo-Ruchamah [Unpitied]; I will say to Lo-'Ammi [Not-My-People], 'You are my people'; and they will say, 'You are my God.'"

For to Moshe he says, “I will have mercy on whom I have mercy, and I will pity whom I pity.”

So then, he has mercy on whom he wants, and he hardens whom he wants.