NET
5 They answered Jeremiah, “May the Lord be a true and faithful witness against us if we do not do just as the Lord your God sends you to tell us to do.
Darby
5 And they said to Jeremiah, Jehovah be a true and faithful witness amongst us, if we do not even according to all the word for which Jehovah thy God shall send thee to us.
KJV
5 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 thy God shall send thee to us.