Check out these verses on God’s mercy!
1 Peter 1:3
God forgives all of your sins, heals you, and fills your life with good things. He loves you and treats you tenderly and kindly. And yet you haven’t done anything to deserve all of this. That’s God’s mercy, undeserved kindness.
Saul killed Christians and talked against Jesus. But in spite of all this, Jesus appeared to him and forgave him. Read how God showed His mercy toward this persecutor of the church in Acts chapters 8-9 and 1 Timothy 1:12-15.