'Sure' in the Bible

When Peter came to himself, he said, “Now I know for sure that the Lord has sent forth His angel and rescued me from the hand of Herod and from all that the Jewish people were expecting.”

As for the fact that He raised Him up from the dead, no longer to return to decay, He has spoken in this way: ‘I will give you the holy and sure blessings of David.’

And those who were with me saw the light, to be sure, but did not understand the voice of the One who was speaking to me.