Jeremiah 42:5

5 And they said to Jeremy, The Lord be (a) witness of truth and of faith betwixt us; if not by each word, in which thy Lord God shall send thee to us, so we shall do, (And they said to Jeremiah, May the Lord be a true and faithful witness against us, if we do not do each command, which the Lord thy God shall give to thee, for us,)

Jeremiah 42:5 Meaning and Commentary

Jeremiah 42:5

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.

Jeremiah 42:5 In-Context

3 and thy Lord God tell to us the way, by which we shall go, and the word which we shall do. (and the Lord thy God tell us the way, by which we shall go, and everything that we should do.)

4 Forsooth Jeremy, the prophet, said to them, I have heard (you); lo! I pray to our Lord God, by your words (lo! I shall pray to the Lord your God, with your words); I shall show to you each word, whatever word the Lord shall answer to me, neither I shall hide anything from you.

5 And they said to Jeremy, The Lord be (a) witness of truth and of faith betwixt us; if not by each word, in which thy Lord God shall send thee to us, so we shall do, (And they said to Jeremiah, May the Lord be a true and faithful witness against us, if we do not do each command, which the Lord thy God shall give to thee, for us,)

6 whether it be good either evil. We shall obey to the voice of our Lord God, to whom we send thee, that it be well to us, when we have heard the voice of our Lord God. (whether it be good or evil. We shall obey the voice of the Lord our God, to whom we send thee, so that it may be well with us, when we have heard the voice of the Lord our God.)

7 Forsooth when ten days were [ful]filled, the word of the Lord was made to Jeremy.