'Certainly' in the Bible

Then Nebuchadnezzar the king hath been astonished, and hath risen in haste; he hath answered and said to his counsellors, 'Have we not cast three men into the midst of the fire -- bound?' They have answered and are saying to the king, 'Certainly, O king.'

and his sons stir themselves up, and have gathered a multitude of great forces, and he hath certainly come in, and overflowed, and passed through, and he turneth back, and they stir themselves up unto his stronghold.

'And the king of the north hath turned back, and hath caused a multitude to stand, greater than the first, and at the end of the times a second time he doth certainly come in with a great force, and with much substance;