2 Chronicles 7:22

And they shall say, Because they forsook Jehovah the God of their fathers, who brought them forth out of the land of Egypt, and have attached themselves to other gods, and have worshipped them and served them; therefore he has brought upon them all this evil.

Judges 2:12-13

and they forsook the LORD, the God of their fathers, who had brought them out of the land of Egypt; they went after other gods, from among the gods of the peoples who were round about them, and bowed down to them; and they provoked the LORD to anger.

2 Chronicles 36:17

And he brought up against them the king of the Chaldees, and slew their young men with the sword in the house of their sanctuary, and spared not young man nor maiden, old man nor him of hoary head: he gave them all into his hand.

Jeremiah 1:16

and I will pronounce my judgments against them for all their wickedness, in that they have forsaken me, and have burned incense unto other gods, and worshipped the works of their own hands.

Lamentations 2:16-17

All thine enemies open their mouth against thee, they hiss and gnash the teeth: they say, We have swallowed her up; this is forsooth the day that we looked for: we have found, we have seen it.

Lamentations 4:13-15

It is for the sins of her prophets, and the iniquities of her priests, who have shed the blood of the righteous in the midst of her.

Ezekiel 14:23

And they shall comfort you, when ye see their way and their doings; and ye shall know that I have not done without cause all that I have done in it, saith the Lord Jehovah.

Ezekiel 36:17-20

Son of man, when the house of Israel dwelt in their own land, they defiled it by their way and by their doings: their way was before me as the uncleanness of a woman in her separation.

Daniel 9:12

And he hath performed his words, which he spoke against us, and against our judges that judged us, by bringing upon us a great evil; so that there hath not been done under the whole heaven as hath been done upon 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 forsook the LORD, the God of their fathers, who had brought them out of the land of Egypt; they went after other gods, from among the gods of the peoples who were round about them, and bowed down to them; and they provoked the LORD to anger.
Jeremiah 1:16
and I will pronounce my judgments against them for all their wickedness, in that they have forsaken me, and have burned incense unto other gods, and worshipped the works of their own hands.
Lamentations 2:16
All thine enemies open their mouth against thee, they hiss and gnash the teeth: they say, We have swallowed her up; this is forsooth the day that we looked for: we have found, we have seen it.
Lamentations 4:13
It is for the sins of her prophets, and the iniquities of her priests, who have shed the blood of the righteous in the midst of her.
Ezekiel 14:23
And they shall comfort you, when ye see their way and their doings; and ye shall know that I have not done without cause all that I have done in it, saith the Lord Jehovah.
Ezekiel 36:17
Son of man, when the house of Israel dwelt in their own land, they defiled it by their way and by their doings: their way was before me as the uncleanness of a woman in her separation.

Therefore

2 Chronicles 36:17
And he brought up against them the king of the Chaldees, and slew their young men with the sword in the house of their sanctuary, and spared not young man nor maiden, old man nor him of hoary head: he gave them all into his hand.
Daniel 9:12
And he hath performed his words, which he spoke against us, and against our judges that judged us, by bringing upon us a great evil; so that there hath not been done under the whole heaven as hath been done upon Jerusalem.

General references

Deuteronomy 29:24
even all nations shall say, Why has Jehovah done thus to this land? whence the heat of this great anger?
Jeremiah 22:8
And many nations shall pass by this city, and they shall say every man to his neighbour, Wherefore hath Jehovah done thus unto this great city?
Ezekiel 20:48
And all flesh shall see that I Jehovah have kindled it: it shall not be quenched.