Then they said to Jeremiah, "May the LORD be a true and faithful witness against us if we do not act upon every word that the LORD your God sends you to tell us.

Genesis 31:50
If you mistreat my daughters or take other wives, although no one is with us, remember that God is a witness between you and me."

Judges 11:10
And the elders of Gilead said to Jephthah, "The LORD is our witness if we do not do as you say."

Jeremiah 43:2
Azariah son of Hoshaiah, Johanan son of Kareah, and all the arrogant men said to Jeremiah, "You are lying! The LORD our God has not sent you to say, 'You must not go to Egypt to reside there.'

Jeremiah 43:4
So Johanan son of Kareah and all the commanders of the forces disobeyed the command of the LORD to stay in the land of Judah.

Micah 1:2
Hear, O peoples, all of you; listen, O earth, and everyone in it! May the Lord GOD bear witness against you, the Lord from His holy temple.

Malachi 2:14
Yet you ask, "Why?" It is because the LORD has been a witness between you and the wife of your youth, against whom you have broken faith, though she is your companion and your wife by covenant.

Malachi 3:5
"Then I will draw near to you for judgment. And I will be a swift witness against sorcerers and adulterers and perjurers, against oppressors of the widowed and fatherless, and against those who defraud laborers of their wages and deny justice to the foreigner but do not fear Me," says the LORD of Hosts.

Then they said to Jeremiah, The LORD be a true and faithful witness between us, if we do not even according to all things for the which the LORD your God shall send you to us.