Psalm 95:10

Forty years I am weary of the generation, And I say, 'A people erring in heart -- they! And they have not known My ways:'

Hebrews 3:17

but with whom was He grieved forty years? was it not with those who did sin, whose carcasses fell in the wilderness?

Acts 7:36

this one did bring them forth, having done wonders and signs in the land of Egypt, and in the Red Sea, and in the wilderness forty years;

Genesis 6:6

and Jehovah repenteth that He hath made man in the earth, and He grieveth Himself -- unto His heart.

Numbers 14:33-34

and your sons are evil in the wilderness forty years, and have borne your whoredoms till your carcases are consumed in the wilderness;

Numbers 32:13

and the anger of Jehovah burneth against Israel, and He causeth them to wander in the wilderness forty years, until the consumption of all the generation which is doing the evil thing in the eyes of Jehovah.

Deuteronomy 1:3

And it cometh to pass in the fortieth year, in the eleventh month, on the first of the month hath Moses spoken unto the sons of Israel according to all that Jehovah hath commanded him concerning them;

Deuteronomy 2:14-16

And the days which we have walked from Kadesh-Barnea until that we have passed over the brook Zered, are thirty and eight years, till the consumption of all the generation of the men of battle from the midst of the camp, as Jehovah hath sworn to them;

Proverbs 1:7

Fear of Jehovah is a beginning of knowledge, Wisdom and instruction fools have despised!

Proverbs 1:22-29

'Till when, ye simple, do ye love simplicity? And have scorners their scorning desired? And do fools hate knowledge?

Isaiah 63:17

Why causest Thou us to wander, O Jehovah, from Thy ways? Thou hardenest our heart from Thy fear, Turn back for Thy servants' sake, The tribes of Thine inheritance.

Jeremiah 9:6

thy dwelling is in the midst of deceit, Through deceit they refused to know Me, An affirmation of Jehovah.

John 3:19-21

'And this is the judgment, that the light hath come to the world, and men did love the darkness rather than the light, for their works were evil;

Acts 13:18

and about a period of forty years He did suffer their manners in the wilderness,

Romans 1:28

And, according as they did not approve of having God in knowledge, God gave them up to a disapproved mind, to do the things not seemly;

Ephesians 4:30

and make not sorrowful the Holy Spirit of God, in which ye were sealed to a day of redemption.

Hebrews 3:9-10

in which tempt Me did your fathers, they did prove Me, and saw My works 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:

General references

Bible References

Forty

Numbers 14:33
and your sons are evil in the wilderness forty years, and have borne your whoredoms till your carcases are consumed in the wilderness;
Numbers 32:13
and the anger of Jehovah burneth against Israel, and He causeth them to wander in the wilderness forty years, until the consumption of all the generation which is doing the evil thing in the eyes of Jehovah.
Deuteronomy 1:3
And it cometh to pass in the fortieth year, in the eleventh month, on the first of the month hath Moses spoken unto the sons of Israel according to all that Jehovah hath commanded him concerning them;
Deuteronomy 2:14
And the days which we have walked from Kadesh-Barnea until that we have passed over the brook Zered, are thirty and eight years, till the consumption of all the generation of the men of battle from the midst of the camp, as Jehovah hath sworn to them;
Hebrews 3:9
in which tempt Me did your fathers, they did prove Me, and saw My works forty years;

And they

Proverbs 1:7
Fear of Jehovah is a beginning of knowledge, Wisdom and instruction fools have despised!
Jeremiah 9:6
thy dwelling is in the midst of deceit, Through deceit they refused to know Me, An affirmation of Jehovah.
John 3:19
'And this is the judgment, that the light hath come to the world, and men did love the darkness rather than the light, for their works were evil;
Romans 1:28
And, according as they did not approve of having God in knowledge, God gave them up to a disapproved mind, to do the things not seemly;

General references

Psalm 78:17
And they add still to sin against Him, To provoke the Most High in the dry place.