'Truly' in the Bible

And they said to Joshua, Truly, the Lord has given all the land into our hands; and all the people of the land have become like water because of us.

And Achan, answering, said to Joshua, Truly I have done wrong against the Lord, the God of Israel, and this is what I have done:

And on that day Moses took an oath, saying, Truly the land where your feet have been placed will become a heritage for you and your children for ever, because you have been true to the Lord your God with all your heart.