'Calm' in the Bible

Tell him, "Be careful, be calm, don't be afraid, and don't lose heart because of these two smoldering stumps of torches, that is, because of the fierce anger of Rezin, from Aram, and Remaliah's son.

For this is what the LORD GOD, the Holy One of Israel, says: "In repentance and rest you will be saved; in staying calm and trusting will be your strength. But you refused.