Deuteronomy 8:19

And it shall be, if thou shalt forget Jehovah thy God, and walk after other gods, and serve them, and worship them, I testify against you this day that ye shall surely perish.

Deuteronomy 4:26

I call heaven and earth to witness against you this day, that ye shall soon utterly perish from off the land whereunto ye go over the Jordan to possess it; ye shall not prolong your days upon it, but shall utterly be destroyed.

Deuteronomy 28:58-68

If thou wilt not observe to do all the words of this law that are written in this book, that thou mayest fear this glorious and fearful name, JEHOVAH THY GOD;

Deuteronomy 29:25-28

Then men shall say, Because they forsook the covenant of Jehovah, the God of their fathers, which he made with them when he brought them forth out of the land of Egypt,

Deuteronomy 30:18-19

I denounce unto you this day, that ye shall surely perish; ye shall not prolong your days in the land, whither thou passest over the Jordan to go in to possess it.

Joshua 23:13

know for a certainty that Jehovah your God will no more drive these nations from out of your sight; but they shall be a snare and a trap unto you, and a scourge in your sides, and thorns in your eyes, until ye perish from off this good land which Jehovah your God hath given you.

1 Samuel 12:25

But if ye shall still do wickedly, ye shall be consumed, both ye and your king.

Daniel 9:2

in the first year of his reign I, Daniel, understood by the books the number of the years whereof the word of Jehovah came to Jeremiah the prophet, for the accomplishing of the desolations of Jerusalem, even seventy years.

Amos 3:2

You only have I known of all the families of the earth: therefore I will visit upon you all your iniquities.

Zephaniah 1:18

Neither their silver nor their gold shall be able to deliver them in the day of Jehovah's wrath; but the whole land shall be devoured by the fire of his jealousy: for he will make an end, yea, a terrible end, of all them that dwell in the land.

Zephaniah 3:6

I have cut off nations; their battlements are desolate; I have made their streets waste, so that none passeth by; their cities are destroyed, so that there is no man, so that there is no inhabitant.

Luke 12:47-48

And that servant, who knew his lord's will, and made not ready, nor did according to his will, shall be beaten with many'stripes ;

Luke 13:3

I tell you, Nay: but, except ye repent, ye shall all in like manner perish.

Luke 13:5

I tell you, Nay: but, except ye repent, ye shall all likewise perish.

Treasury of Scripture Knowledge

Summary

And it shall be, if thou do at all forget the LORD thy God, and walk after other gods, and serve them, and worship them, I testify against you this day that ye shall surely perish.

General references

Bible References

I testify against

Deuteronomy 4:26
I call heaven and earth to witness against you this day, that ye shall soon utterly perish from off the land whereunto ye go over the Jordan to possess it; ye shall not prolong your days upon it, but shall utterly be destroyed.
Deuteronomy 28:58
If thou wilt not observe to do all the words of this law that are written in this book, that thou mayest fear this glorious and fearful name, JEHOVAH THY GOD;
Deuteronomy 29:25
Then men shall say, Because they forsook the covenant of Jehovah, the God of their fathers, which he made with them when he brought them forth out of the land of Egypt,
Deuteronomy 30:18
I denounce unto you this day, that ye shall surely perish; ye shall not prolong your days in the land, whither thou passest over the Jordan to go in to possess it.
Joshua 23:13
know for a certainty that Jehovah your God will no more drive these nations from out of your sight; but they shall be a snare and a trap unto you, and a scourge in your sides, and thorns in your eyes, until ye perish from off this good land which Jehovah your God hath given you.
1 Samuel 12:25
But if ye shall still do wickedly, ye shall be consumed, both ye and your king.
Daniel 9:2
in the first year of his reign I, Daniel, understood by the books the number of the years whereof the word of Jehovah came to Jeremiah the prophet, for the accomplishing of the desolations of Jerusalem, even seventy years.
Amos 3:2
You only have I known of all the families of the earth: therefore I will visit upon you all your iniquities.
Zephaniah 1:18
Neither their silver nor their gold shall be able to deliver them in the day of Jehovah's wrath; but the whole land shall be devoured by the fire of his jealousy: for he will make an end, yea, a terrible end, of all them that dwell in the land.
Zephaniah 3:6
I have cut off nations; their battlements are desolate; I have made their streets waste, so that none passeth by; their cities are destroyed, so that there is no man, so that there is no inhabitant.
Luke 12:47
And that servant, who knew his lord's will, and made not ready, nor did according to his will, shall be beaten with many'stripes ;
Luke 13:3
I tell you, Nay: but, except ye repent, ye shall all in like manner perish.

General references

Deuteronomy 30:18
I denounce unto you this day, that ye shall surely perish; ye shall not prolong your days in the land, whither thou passest over the Jordan to go in to possess it.
Jeremiah 25:6
and go not after other gods to serve them, and to worship them, and provoke me not to anger with the work of your hands; and I will do you no hurt.

American Standard Version Public Domain