2 Chronicles 7:22

And their answer will be, Because they were turned away from the Lord, the God of their fathers, who took them out of the land of Egypt, and took for themselves other gods and gave them worship and became their servants: that is why he has sent all this evil on them.

Judges 2:12-13

And they gave up the Lord, the God of their fathers, who had taken them out of the land of Egypt, and went after other gods, the gods of the peoples round about them, worshipping them and moving the Lord to wrath.

2 Chronicles 36:17

So he sent against them the king of the Chaldaeans, who put their young men to death with the sword in the house of their holy place, and had no pity for any, young man or virgin, old man or white-haired: God gave them all into his hands.

Jeremiah 1:16

And I will give my decision against them on account of all their evil-doing; because they have given me up, burning perfumes to other gods and worshipping the works of their hands.

Lamentations 2:16-17

All your haters are opening their mouths wide against you; making hisses and whistling through their teeth, they say, We have made a meal of her: certainly this is the day we have been looking for; it has come, we have seen it.

Lamentations 4:13-15

It is because of the sins of her prophets and the evil-doing of her priests, by whom the blood of the upright has been drained out in her.

Ezekiel 14:23

They will give you comfort when you see their ways and their doings: and you will be certain that not for nothing have I done all the things I have done in it, says the Lord.

Ezekiel 36:17-20

Son of man, when the children of Israel were living in their land, they made it unclean by their way and their acts: their way before me was as when a woman is unclean at the time when she is kept separate.

Daniel 9:12

And he has given effect to his words which he said against us and against those who were our judges, by sending a great evil on us: for under all heaven there has not been done what has been done to Jerusalem.

Treasury of Scripture Knowledge

Summary

And it shall be answered, Because they forsook the LORD God of their fathers, which brought them forth out of the land of Egypt, and laid hold on other gods, and worshipped them, and served them: therefore hath he brought all this evil upon them.

Bible References

Because they forsook

Judges 2:12
And they gave up the Lord, the God of their fathers, who had taken them out of the land of Egypt, and went after other gods, the gods of the peoples round about them, worshipping them and moving the Lord to wrath.
Jeremiah 1:16
And I will give my decision against them on account of all their evil-doing; because they have given me up, burning perfumes to other gods and worshipping the works of their hands.
Lamentations 2:16
All your haters are opening their mouths wide against you; making hisses and whistling through their teeth, they say, We have made a meal of her: certainly this is the day we have been looking for; it has come, we have seen it.
Lamentations 4:13
It is because of the sins of her prophets and the evil-doing of her priests, by whom the blood of the upright has been drained out in her.
Ezekiel 14:23
They will give you comfort when you see their ways and their doings: and you will be certain that not for nothing have I done all the things I have done in it, says the Lord.
Ezekiel 36:17
Son of man, when the children of Israel were living in their land, they made it unclean by their way and their acts: their way before me was as when a woman is unclean at the time when she is kept separate.

Therefore

2 Chronicles 36:17
So he sent against them the king of the Chaldaeans, who put their young men to death with the sword in the house of their holy place, and had no pity for any, young man or virgin, old man or white-haired: God gave them all into his hands.
Daniel 9:12
And he has given effect to his words which he said against us and against those who were our judges, by sending a great evil on us: for under all heaven there has not been done what has been done to Jerusalem.

General references

Deuteronomy 29:24
Truly all the nations will say, Why has the Lord done so to this land? what is the reason for this great and burning wrath?
Jeremiah 22:8
And nations from all sides will go past this town, and every man will say to his neighbour, Why has the Lord done such things to this great town?
Ezekiel 20:48
And all flesh will see that I the Lord have had it lighted: it will not be put out.

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