Jeremiah 15:21

And I will deliver thee out of the hand of the wicked, and I will redeem thee out of the hand of the terrible.

The promise is that God will rescue Jeremiah from wicked and powerful enemies who oppose him. His deliverance will come from the hand of the wicked and his redemption from the hand of the terrible, leaving him secure against their hatred and strength. God's abiding presence with His prophet guarantees that those who fight against him will not prevail over him. That assurance was fulfilled when priests and false prophets demanded Jeremiah's death yet influential men rose to plead in his behalf. Through their intercession his life was spared, proving that his adversaries could not overcome the divine protection surrounding him.