'Certainly' in the Bible

Manoah said to his wife, "We will certainly die, because we have seen a supernatural being!"

But his father and mother said to him, "Certainly you can find a wife among your relatives or among all our people! You should not have to go and get a wife from the uncircumcised Philistines." But Samson said to his father, "Get her for me, because she is the right one for me."

The Israelites asked, "Who from all the Israelite tribes has not assembled before the Lord?" They had made a solemn oath that whoever did not assemble before the Lord at Mizpah must certainly be executed.