Jeremiah 1:17-19

17But you [Jeremiah], gird up your loins [in preparation]! Get up and tell them all which I command you. Do not be distraught and break down at the sight of their [hostile] faces, or I will bewilder you before them and allow you to be overcome.

18Now behold, I have made you today like a fortified city and like an iron pillar and like bronze walls against the whole land—against the [successive] kings of Judah, against its leaders, against its priests, and against the people of the land [giving you divine strength which no hostile power can overcome].

19They will fight against you, but they will not [ultimately] prevail over you, for I am with you [always] to protect you and deliver you,” says the Lord.