'Certainly' in the Bible

All that My Father gives Me will come to Me; and the one who comes to Me I will most certainly not cast out [I will never, never reject anyone who follows Me].

Listening to these words, some of the people said, “This is certainly the Prophet!”

So Pilate said to Him, “Then You are a King?” Jesus answered, “You say [correctly] that I am a King. This is why I was born, and for this I have come into the world, to testify to the truth. Everyone who is of the truth [who is a friend of the truth and belongs to the truth] hears and listens carefully to My voice.”