'Certainly' in the Bible

For thus Amos saith: Jeroboam shall die by the sword, and Israel shall certainly go into captivity out of his land.

Therefore thus saith Jehovah: Thy wife shall be a harlot in the city, and thy sons and thy daughters shall fall by the sword, and thy land shall be divided with the line; and thou shalt die in a land that is unclean; and Israel shall certainly go into captivity, out of his land.

Jehovah hath sworn by the glory of Jacob, Certainly I will never forget any of their works.