'Suppose' in the Bible

But just suppose you continue to say, 'The message of the Lord is burdensome.' Here is what the Lord says will happen: 'I sent word to you that you must not say, "The Lord's message is burdensome." But you used the words "The Lord's message is burdensome" anyway.

But suppose a nation or a kingdom will not be subject to King Nebuchadnezzar of Babylon. Suppose it will not submit to the yoke of servitude to him. I, the Lord, affirm that I will punish that nation. I will use the king of Babylon to punish it with war, starvation, and disease until I have destroyed it.