Hebrews 3:17

And who was God angry with for forty years? Was it not with those people who sinned, whose bodies fell [dead] in the desert?

Acts 7:36

This man led them out [of Egypt], performing wonders and [miraculous] signs in Egypt, at the Red Sea and in the wilderness for forty years.

John 3:19-21

Now this is [how God's] judgment [works]: The Light [See 1:5-9] has come into the world, but people loved darkness [i.e., sin] rather than the Light, because their deeds were evil.

Acts 13:18

For about forty years He tenderly cared for them in the wilderness.

Romans 1:28

And since these people refused to acknowledge God, He has allowed [or, abandoned] them to have degraded minds and to practice those things which they should not do.

Ephesians 4:30

And do not grieve God's Holy Spirit by whom you were sealed [i.e., given evidence of God's ownership] until the day of redemption [i.e., until you receive your new body in heaven. See 1:14].

Hebrews 3:9-10

where your forefathers tried me and tested [my patience] when they saw what I did for forty years.

Treasury of Scripture Knowledge

Summary

Forty years long was I grieved with this generation, and said, It is a people that do err in their heart, and they have not known my ways:

Forty

Bible References

Forty

Hebrews 3:9
where your forefathers tried me and tested [my patience] when they saw what I did for forty years.

And they

John 3:19
Now this is [how God's] judgment [works]: The Light [See 1:5-9] has come into the world, but people loved darkness [i.e., sin] rather than the Light, because their deeds were evil.
Romans 1:28
And since these people refused to acknowledge God, He has allowed [or, abandoned] them to have degraded minds and to practice those things which they should not do.