'Certainly' in the Bible

Because Moses said, "Honor your father and your mother,' and, "Whoever curses his father or mother must certainly be put to death.'

because those days will be a time of suffering, a kind that has not happened from the beginning of God's creation until now, and certainly will never happen again.

But Peter told him, "Even if everyone else turns against you, I certainly won't."

When the centurion who stood facing Jesus saw how he had cried out and breathed his last, he said, "This man certainly was the Son of God!"