2 Chronicles 7:22

And it shall be answered then, 'Because they forsook the LORD God of their fathers which brought them out of the land of Egypt, and caught hold on other gods, and bowed to them and served them: even therefore brought he on them all this evil.'"

Judges 2:12-13

and forsook the LORD God of their fathers, which brought them out of the land of Egypt, and followed strange gods, even of the gods of the nations that were round about them, and bowed themselves unto them, and angered the LORD.

2 Chronicles 36:17

And so he brought upon them the king of Chaldeans and slew their young men with the sword in their holy temple, and neither spared young man nor maiden, neither old man, neither so much as him that stooped for age: But gave all into his hand.

Jeremiah 1:16

And through them shall I declare my judgment, upon all the wickedness of those men that have forsaken me: that have offered unto strange gods, and worshipped the works of their own hands.

Lamentations 2:16-17

{Ayin} All thine enemies gape upon thee, whispering and biting their teeth, saying, "Let us devour, for the time that we looked for is come: we have found and seen it."

Lamentations 4:13-15

{Mem} Which nevertheless is come to pass for the sins of her prophets, and for the wickedness of her priests that have shed innocents' blood within her.

Ezekiel 14:23

They shall comfort you, when ye see their way and works: and ye shall know how that it is not without a cause, that I have done so against Jerusalem, as I did, sayeth the LORD God.

Ezekiel 36:17-20

"O thou son of man, when the house of Israel dwelt upon their own ground, they defiled themselves with their own ways and imaginations: so that in my sight their way was like the uncleanness of a menstruous woman.

Daniel 9:12

And he hath performed his words, which he spake against us, and against our judges that judged us: to bring upon us such a great plague, as never was under heaven, like as it is now come to pass in 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 the LORD God of their fathers, which brought them out of the land of Egypt, and followed strange gods, even of the gods of the nations that were round about them, and bowed themselves unto them, and angered the LORD.
Jeremiah 1:16
And through them shall I declare my judgment, upon all the wickedness of those men that have forsaken me: that have offered unto strange gods, and worshipped the works of their own hands.
Lamentations 2:16
{Ayin} All thine enemies gape upon thee, whispering and biting their teeth, saying, "Let us devour, for the time that we looked for is come: we have found and seen it."
Lamentations 4:13
{Mem} Which nevertheless is come to pass for the sins of her prophets, and for the wickedness of her priests that have shed innocents' blood within her.
Ezekiel 14:23
They shall comfort you, when ye see their way and works: and ye shall know how that it is not without a cause, that I have done so against Jerusalem, as I did, sayeth the LORD God.
Ezekiel 36:17
"O thou son of man, when the house of Israel dwelt upon their own ground, they defiled themselves with their own ways and imaginations: so that in my sight their way was like the uncleanness of a menstruous woman.

Therefore

2 Chronicles 36:17
And so he brought upon them the king of Chaldeans and slew their young men with the sword in their holy temple, and neither spared young man nor maiden, neither old man, neither so much as him that stooped for age: But gave all into his hand.
Daniel 9:12
And he hath performed his words, which he spake against us, and against our judges that judged us: to bring upon us such a great plague, as never was under heaven, like as it is now come to pass in Jerusalem.

General references

Deuteronomy 29:24
And then all nations also say, "Wherefore hath the LORD done of this fashion unto this land? O how fierce is this great wrath?'
Jeremiah 22:8
And all the people that go by this city, shall speak one to another: Wherefore hath the LORD done thus unto this noble city?
Ezekiel 20:48
And all flesh shall see, that I the LORD have kindled it, so that no man may quench it.'"