'Shall' in the Bible

So the captain came up to him and said, “How can you stay asleep? Get up! Call on your god! Perhaps your god will give a thought to us so that we will not perish.”

Then they said to him, “What should we do to you, so that the sea will become calm for us?”—for the sea was becoming more and more violent.

Jonah said to them, “Pick me up and throw me into the sea. Then the sea will become calm for you, for I know that it is because of me that this great storm has come upon you.”

Then on the first day’s walk, Jonah began to go through the city, and he called out and said, “Forty days more [remain] and [then] Nineveh will be overthrown!”