'Fast' in the Bible

Then she saddled the donkey and said to her servant, “Drive [the animal] fast; do not slow down the pace for me unless I tell you.”

Now Elisha was sitting in his house, and the elders were sitting with him. And the king sent a man ahead of him [to behead Elisha]; but before the messenger arrived, Elisha told the elders, “Do you see how this son of [Jezebel] a murderer has sent [a man] to remove my head? Look, when the messenger comes, shut the door and hold it securely against him. Is not the sound of his master’s feet [just] behind him?”

For he clung to the Lord; he did not turn away from [faithfully] following Him, but he kept His commandments, which the Lord had commanded Moses.