Jeremiah 15:20
And I will make thee unto this people a fenced brasen wall: and they shall fight against thee, but they shall not prevail against thee: for I am with thee to save thee and to deliver thee, saith the LORD. And I will make thee unto this people a fenced brasen wall: and they shall fight against thee, but they shall not prevail against thee: for I am with thee to save thee and to deliver thee, saith the LORD.
God would make Jeremiah a fortified bronze wall to the people, so that they would fight against him yet would not overcome him, because the Lord was with him to save him and to deliver him. The attack he faced in this promise included priests and false prophets who wanted him put to death. That promised protection sustained him throughout his ministry in the midst of such hostility.