'Surely' in the Bible

The grass dries up, the flowers wither, when the wind sent by the Lord blows on them. Surely humanity is like grass.

I solemnly make this oath -- what I say is true and reliable: 'Surely every knee will bow to me, every tongue will solemnly affirm;

Look all around you! All of them gather to you. As surely as I live," says the Lord, "you will certainly wear all of them like jewelry; you will put them on as if you were a bride.