'Certainly' in the Bible

I call heaven and earth as witnesses against you today that you will quickly perish from the land you are about to cross the Jordan to possess. You will not live long there, but you will certainly be destroyed.

“This command that I give you today is certainly not too difficult or beyond your reach.

I tell you today that you will certainly perish and will not live long in the land you are entering to possess across the Jordan.

I will certainly hide My face on that day because of all the evil they have done by turning to other gods.