'Certainly' in the Bible

Therefore, as I live, saith Jehovah of hosts, the God of Israel, Moab shall certainly be as Sodom, and the children of Ammon as Gomorrah, a possession of nettles, and salt-pits, and a perpetual desolation; the remnant of my people shall spoil them, and the residue of my nation shall possess them.

I thought: You will certainly fear Meand accept correction.Then her dwelling placewould not be cut offbased on all that I had allocated to her.However, they became more corruptin all their actions.