Romans 9:15

For he says to Moses, I will shew mercy to whom I will shew mercy, and I will feel compassion for whom I will feel compassion.

Exodus 33:19

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

Romans 9:16

So then it is not of him that wills, nor of him that runs, but of God that shews mercy.

Romans 9:18-19

So then, to whom he will he shews mercy, and whom he will he hardens.

Exodus 34:6-7

And Jehovah passed by before his face, and proclaimed, Jehovah, Jehovah God merciful and gracious, slow to anger, and abundant in goodness and truth,

Isaiah 27:11

When its branches are withered they shall be broken off; women shall come and set them on fire. For it is a people of no intelligence; therefore he that made them will not have mercy on them, and he who formed them will shew them no favour.

Micah 7:18

Who is a God like unto thee, that forgiveth iniquity, and passeth by the transgression of the remnant of his heritage? He retaineth not his anger for ever, because he delighteth in loving-kindness.

Treasury of Scripture Knowledge

Summary

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.

Bible References

I will have

Romans 9:16
So then it is not of him that wills, nor of him that runs, but of God that shews mercy.
Exodus 33:19
And he said, I will make all my goodness pass before thy face, and I will proclaim the name of Jehovah before thee; and I will be gracious to whom I will be gracious, and I will shew mercy on whom I will shew mercy.
Exodus 34:6
And Jehovah passed by before his face, and proclaimed, Jehovah, Jehovah God merciful and gracious, slow to anger, and abundant in goodness and truth,
Isaiah 27:11
When its branches are withered they shall be broken off; women shall come and set them on fire. For it is a people of no intelligence; therefore he that made them will not have mercy on them, and he who formed them will shew them no favour.
Micah 7:18
Who is a God like unto thee, that forgiveth iniquity, and passeth by the transgression of the remnant of his heritage? He retaineth not his anger for ever, because he delighteth in loving-kindness.