Then they said to Jeremiah, the Lord be a true and faithful witness between us,.... Which is the form of an oath; a solemn appeal to God, as a witness to what they were about to say, and to the sincerity of their hearts in it; who is true to his word, and faithful to his promises and threatenings; and who bears a true and faithful testimony, and will do what is just and right; and yet these people never intended to perform what they promised; which is a most shocking piece of atheism in a professing people; and who, at this very time, could not but observe the judgments of God upon their nation, city, and temple:
if we do not even according to all things for the which the Lord thy God shall send thee to us; they promise to do everything the Lord should signify by the prophet as his will; and, if they did not, wish the severest judgments of God might fall upon them.