'Surely' in the Bible

Does a bird swoop down into a trap on the ground if there is no bait? Does a trap spring up from the ground unless it has surely caught something?

"But surely I gave you no food to eat in any of your cities; you lacked food everywhere you live. Still you did not come back to me." The Lord is speaking!

These are the ones who now take oaths in the name of the sinful idol goddess of Samaria. They vow, 'As surely as your god lives, O Dan,' or 'As surely as your beloved one lives, O Beer Sheba!' But they will fall down and not get up again."