Therefore prophesy, son of man, and tell Gog that this is what the Lord GOD says: On that day when My people Israel are dwelling securely, will you not take notice of this?
KJV
Therefore, son of man, prophesy and say unto Gog, Thus saith the Lord GOD; In that day when my people of Israel dwelleth safely, shalt thou not know [it]?
ASV
Therefore, son of man, prophesy, and say unto Gog, Thus saith the Lord Jehovah: In that day when my people Israel dwelleth securely, shalt thou not know it?