'Truly' in the Bible

"Whenever you pray, do not be like the hypocrites, because they love to pray while standing in synagogues and on street corners so that people can see them. Truly I say to you, they have their reward.

Then those who were in the boat worshiped him, saying, "Truly you are the Son of God."

Now when the centurion and those with him who were guarding Jesus saw the earthquake and what took place, they were extremely terrified and said, "Truly this one was God's Son!"