2 Chronicles 7:22

And men shall say, Because they forsook Yahweh the God of their fathers, who brought them up out of the land of Egypt, and laid hold of other gods, and bowed down to them, and served them, for this cause, hath he brought upon them, all this calamity.

Judges 2:12-13

and forsook Yahweh, the God of their fathers, who brought them up out of the land of Egypt, and went after other gods, from among the gods of the peoples who were round about them, and bowed themselves down unto them, - and angered Yahweh.

2 Chronicles 36:17

So he brought up against them the king of the Chaldeans, who slew their young men with the sword, in the house of their sanctuary, and had no compassion upon young man or virgin, elder or ancient,-all, delivered he into his hand.

Jeremiah 1:16

Then will I pronounce my judgments against them, concerning all their wickedness, - in that they have forsaken me and have burned incense unto other gods, and have bowed down to the works of their own hands,

Lamentations 2:16-17

All thy foes, have opened wide, over thee their mouth, They have hissed, and gnashed their teeth, They have said - We have swallowed her up! Surely, this, is the day for which we have waited, We have found! We have seen!

Lamentations 4:13-15

It is for the sins of her prophets, the iniquities of her priests, - who have been pouring out, in her midst, the blood of the righteous!

Ezekiel 14:23

Yea they shall console you, when ye see their way and their doings, - So shall ye know that not without cause, have I done, anything that I have done with her, Declareth My Lord Yahweh.

Ezekiel 36:17-20

Son of man The house of Israel were dwelling upon their own so, But they defiled it by their way, and by their doings. Like the defilement of her that is removed, became their way before me.

Daniel 9:12

Thus hath he confirmed his words which he had spoken against us, and against our judges who had judged us, by bringing in upon us a great calamity, - as to which there had not been done, under all the heavens, as hath been done unto 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 forsook Yahweh, the God of their fathers, who brought them up out of the land of Egypt, and went after other gods, from among the gods of the peoples who were round about them, and bowed themselves down unto them, - and angered Yahweh.
Jeremiah 1:16
Then will I pronounce my judgments against them, concerning all their wickedness, - in that they have forsaken me and have burned incense unto other gods, and have bowed down to the works of their own hands,
Lamentations 2:16
All thy foes, have opened wide, over thee their mouth, They have hissed, and gnashed their teeth, They have said - We have swallowed her up! Surely, this, is the day for which we have waited, We have found! We have seen!
Lamentations 4:13
It is for the sins of her prophets, the iniquities of her priests, - who have been pouring out, in her midst, the blood of the righteous!
Ezekiel 14:23
Yea they shall console you, when ye see their way and their doings, - So shall ye know that not without cause, have I done, anything that I have done with her, Declareth My Lord Yahweh.
Ezekiel 36:17
Son of man The house of Israel were dwelling upon their own so, But they defiled it by their way, and by their doings. Like the defilement of her that is removed, became their way before me.

Therefore

2 Chronicles 36:17
So he brought up against them the king of the Chaldeans, who slew their young men with the sword, in the house of their sanctuary, and had no compassion upon young man or virgin, elder or ancient,-all, delivered he into his hand.
Daniel 9:12
Thus hath he confirmed his words which he had spoken against us, and against our judges who had judged us, by bringing in upon us a great calamity, - as to which there had not been done, under all the heavens, as hath been done unto Jerusalem.

General references

Deuteronomy 29:24
yea all the nations will say, For what cause, hath Yahweh done, thus, unto this land? what meaneth this great heat of anger?
Jeremiah 22:8
Then shall many nations pass by this city, - and shall say, every man to his neighbour, For what cause, hath Yahweh done thus, unto this great city?
Ezekiel 20:48
And all flesh shall see that I. Yahweh have kindled it,- It shall not be quenched.