Hebrews 3:18

And to whom did he swear that they should not enter into his rest, but to them that believed not?

Deuteronomy 1:34-35

And the LORD heard the voice of your words, and was wroth, and swore, saying,

Numbers 14:11

And the LORD said to Moses, How long will this people provoke me? and how long will it be ere they believe me, for all the signs which I have shown among them?

Numbers 14:23

Surely they shall not see the land which I swore to their fathers, neither shall any of them that provoked me see it:

Numbers 14:30

Doubtless ye shall not come into the land concerning which I swore to make you dwell therein, save Caleb the son of Jephunneh, and Joshua the son of Nun.

Numbers 20:12

And the LORD spoke to Moses and Aaron, Because ye believed me not, to sanctify me in the eyes of the children of Israel, therefore ye shall not bring this congregation into the land which I have given them.

Deuteronomy 1:26-32

Notwithstanding, ye would not go up, but rebelled against the commandment of the LORD your God:

Deuteronomy 9:23

Likewise when the LORD sent you from Kadesh-barnea, saying, Go up and possess the land which I have given you; then ye rebelled against the commandment of the LORD your God, and ye believed him not, nor hearkened to his voice.

Psalm 106:24-26

Yes, they despised the pleasant land, they believed not his word:

Hebrews 3:11

So I swore in my wrath, They shall not enter into my rest.)

Hebrews 4:2

For to us was the gospel preached, as well as to them: but the word which they heard did not profit them, not being mixed with faith in them that heard it.

Hebrews 4:6

Seeing therefore it remaineth that some must enter into it, and they to whom it was first preached entered not because of unbelief:

Treasury of Scripture Knowledge

Summary

And to whom sware he that they should not enter into his rest, but to them that believed not?

Bible References

To whom

Hebrews 3:11
So I swore in my wrath, They shall not enter into my rest.)
Numbers 14:30
Doubtless ye shall not come into the land concerning which I swore to make you dwell therein, save Caleb the son of Jephunneh, and Joshua the son of Nun.
Deuteronomy 1:34
And the LORD heard the voice of your words, and was wroth, and swore, saying,

But

Numbers 14:11
And the LORD said to Moses, How long will this people provoke me? and how long will it be ere they believe me, for all the signs which I have shown among them?
Numbers 20:12
And the LORD spoke to Moses and Aaron, Because ye believed me not, to sanctify me in the eyes of the children of Israel, therefore ye shall not bring this congregation into the land which I have given them.
Deuteronomy 1:26
Notwithstanding, ye would not go up, but rebelled against the commandment of the LORD your God:
Deuteronomy 9:23
Likewise when the LORD sent you from Kadesh-barnea, saying, Go up and possess the land which I have given you; then ye rebelled against the commandment of the LORD your God, and ye believed him not, nor hearkened to his voice.
Psalm 106:24
Yes, they despised the pleasant land, they believed not his word:

General references

Deuteronomy 1:32
Yet in this thing ye did not believe the LORD your God,
2 Kings 7:20
And so it happened to him: for the people trod upon him in the gate, and he died.
Psalm 78:17
And they sinned yet more against him by provoking the Most High in the wilderness.
John 9:18
But the Jews did not believe concerning him that he had been blind, and received his sight, until they called the parents of him that had received his sight.