2 Chronicles 7:22

They will answer their own question: 'They abandoned Jehovah the God of their ancestors, who brought them out of Egypt. They adopted other gods, worshiped, and served them. That is why he brought this disaster on them.'

Judges 2:12-13

They forsook Jehovah God of their fathers, which brought them out of the land of Egypt. They followed other gods, of the gods of the people that were round about them. They bowed to them and provoked Jehovah to anger.

2 Chronicles 36:17

So he had the Babylonian king attack them and execute their best young men in their holy temple. He did not spare the best men or the unmarried women, the old people or the sick people. God handed all of them over to him.

Jeremiah 1:16

I will pronounce judgment against my people because of all their wickedness. They abandoned me. They burned incense to other gods. They worshiped what their hands have made.

Lamentations 2:16-17

All your enemies are opening their mouths wide against you. They hiss and whistle through their teeth and say: We have made a meal of her. Certainly this is the day we have been looking for. It has come and we see it.

Lamentations 4:13-15

It is because of the sins of her prophets and the evil doing of her priests. They have drained the blood of the upright out from her.

Ezekiel 14:23

You will be comforted when you see how they live. Then you will know that everything I have done was done for a reason,' declares the Lord Jehovah.'

Ezekiel 36:17-20

Son of man, when the people of Israel lived in their land, they dishonored it by the way they lived and by everything they did. Their ways were as unclean as a woman's menstrual period.

Daniel 9:12

He confirmed his words, which he spoke against us, and against our judges who ruled us. He brought a great evil on us. Nothing under heaven has been done like what was 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
They forsook Jehovah God of their fathers, which brought them out of the land of Egypt. They followed other gods, of the gods of the people that were round about them. They bowed to them and provoked Jehovah to anger.
Jeremiah 1:16
I will pronounce judgment against my people because of all their wickedness. They abandoned me. They burned incense to other gods. They worshiped what their hands have made.
Lamentations 2:16
All your enemies are opening their mouths wide against you. They hiss and whistle through their teeth and say: We have made a meal of her. Certainly this is the day we have been looking for. It has come and we see it.
Lamentations 4:13
It is because of the sins of her prophets and the evil doing of her priests. They have drained the blood of the upright out from her.
Ezekiel 14:23
You will be comforted when you see how they live. Then you will know that everything I have done was done for a reason,' declares the Lord Jehovah.'
Ezekiel 36:17
Son of man, when the people of Israel lived in their land, they dishonored it by the way they lived and by everything they did. Their ways were as unclean as a woman's menstrual period.

Therefore

2 Chronicles 36:17
So he had the Babylonian king attack them and execute their best young men in their holy temple. He did not spare the best men or the unmarried women, the old people or the sick people. God handed all of them over to him.
Daniel 9:12
He confirmed his words, which he spoke against us, and against our judges who ruled us. He brought a great evil on us. Nothing under heaven has been done like what was done to Jerusalem.

General references

Deuteronomy 29:24
All the nations will say: Why has Jehovah done thus to this land? Why this great outburst of anger?'
Jeremiah 22:8
Many nations will pass by this city. They will say to one another: Why has Jehovah done thus to this great city?
Ezekiel 20:48
Then everyone will know that I, Jehovah, started the fire. It will never be put out.'