'Certainly' in the Bible

I have certainly seen the suffering of my people who are in Egypt and have heard their groaning, and I have come down to rescue them. Now come, I will send you to Egypt.'

But Peter said, "Certainly not, Lord, for I have never eaten anything defiled and ritually unclean!"

But I said, 'Certainly not, Lord, for nothing defiled or ritually unclean has ever entered my mouth!'