The standard - A flag or signal, to which the people were to rally.Retire, stay not - Rather, gather your goods together: linger not; “for I” (emphatic, Yahweh) am bringing at this very time etc.
Related Commentaries of Jeremiah 4:6
Jeremiah 4:6
6 Set up the standard toward Zion: retire,a stay not: for I will bring evil from the north, and a great destruction.