People who have themselves gone astray and misled others as well during the lifetime will receive double torment in hereafter!

Verse 38 of Chapter 7:

(Allah) will say: "Enter you in the company of nations who passed away before you, of men and Jinn, into the Fire.'' Every time a new nation enters, it curses its sister nation (that went before) until they are all together in the Fire. The last of them will say to the first of them: "Our Lord! These misled us, so give them a double torment of the Fire.'' He will say: "For each one there is double (torment), but you know not.''