Exodus 4:8

And if they do not have faith in you or give ear to the voice of the first sign, they will have faith in the second sign.

Exodus 4:30-31

And Aaron said to them all the words the Lord had said to Moses, and did the signs before all the people.

Deuteronomy 32:39

See now, I myself am he; there is no other god but me: giver of death and life, wounding and making well: and no one has power to make you free from my hand.

2 Kings 5:7

But the king of Israel, after reading the letter, was greatly troubled and said, Am I God, to give death and life? why does this man send a leper to me to be made well? is it not clear that he is looking for a cause of war?

Job 5:18

For after his punishment he gives comfort, and after wounding, his hands make you well.

Isaiah 28:10

For it is one rule after another; one line after another; here a little, there a little.

John 12:37

But though he had done such a number of signs before them, they still had no belief in him:

Treasury of Scripture Knowledge

Summary

And it shall come to pass, if they will not believe thee, neither hearken to the voice of the first sign, that they will believe the voice of the latter sign.

General references

Bible References

If they

Exodus 4:30
And Aaron said to them all the words the Lord had said to Moses, and did the signs before all the people.
Isaiah 28:10
For it is one rule after another; one line after another; here a little, there a little.
John 12:37
But though he had done such a number of signs before them, they still had no belief in him:

That they

Deuteronomy 32:39
See now, I myself am he; there is no other god but me: giver of death and life, wounding and making well: and no one has power to make you free from my hand.
2 Kings 5:7
But the king of Israel, after reading the letter, was greatly troubled and said, Am I God, to give death and life? why does this man send a leper to me to be made well? is it not clear that he is looking for a cause of war?
Job 5:18
For after his punishment he gives comfort, and after wounding, his hands make you well.

General references

1 Kings 13:3
The same day he gave them a sign, saying, This is the sign which the Lord has given: See, the altar will be broken and the burned waste on it overturned.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain