“And they shall know that I am the LORD, that I have not said in vain that I would do this evil unto them.” Ezekiel 6:10 (KJB)
The phrase “…Shall know that I am the LORD” is used three other times in this chapter (vv. 6, 13, 14), and it is used at least 59 other times throughout the prophecy of Ezekiel. In chapter 6 it is directed toward the nation of Israel, and they are being reminded of why they are in captivity.
God will have His people know that He is the LORD. That should be a reminder to all people of all days, times, ages, that GOD will do whatever it takes to make His people holy; because He is holy.
In many of the other 59 times the phrase is used it is toward the nations around them. The LORD desires that people of all lands know that He is the LORD.
To know that He is the LORD is to know Him personally. Know Him as our Creator, the All Powerful, All Knowing, All Present, and Immutable [Unchanging] God; also to know Him as Redeemer, Savior, Lord, and King. To know Him is to see Him revealed in the person of His Son Jesus Christ who took all of our sin upon Himself upon the cross, bled and died, was buried, and He rose from death, conquering death, hell, and the grave; and He forever lives as our Mediator between God and men (1 Timothy 2:5).
Turn to Jesus Christ from sin, and know that the LORD, He is the LORD.