Fear the Lord. His name is Holy

Jeremiah 29:21-32
There were three false prophets written here, Ahan son of Kolaiah  and Zedekiah son of Maaseiah, who are prophesying lies to you in God's name. They will be handed over to Nebuchadnezzar king of Babylon by the Lord, he will be put to death before your very eyes.
Shemaiah the Nehelamite said to priest Zephaniah,' The Lord has appointed you priest in place of Jehoiada to be in charge of the house of the Lord; you should put any madman who acts like a prophet into the stocks and neck-irons.'
After Zephaniah read the letter to Jeremiah , the word of the Lord came to Jeremiah, ' Because Shemaiah has prophesied to you, even though I did not send him, and has led you to believe to him, I will surely punish Shemaiah and his descendants. He will have no one left among this people, nor will he see the good things I will do for my people.'
Why?
The false prophets predicted a swift return. Jeremiah advises the exiles to settle down and live a normal life: the exile will last 70 years. then they will return. But even from Babylon his enemies try to stir up trouble from him.
Those false prophets they did not fear the Lord so they prophesy in the name of the Lord. The Lord is a living God, he won't allow people speak in His name without His permission. The curse from the Lord is terrible thing.
How?
Fear the Lord, for His name is Holy and Almighty.