Jeremiah 15:20

And I will make thee unto this people a fenced brazen wall: these words are expounded by those that follow. They shall fight against thee, but they shall not prevail against thee: look, as men may throw stones or strike at a brazen wall, but do it no hurt; so, saith God, though thou shalt have enemies that will be offering at thee, yet if thou continuest steady in the doing of thy duty, they shall do thee no harm; for thou shalt have my power engaged for thee, to deliver and save thee from their malice.