What is the meaning of "Al-Murjifun" (those who spread rumors), and what is the verse in which this word appears? And what is meant by "Al-Fitnah" (persecution/temptation) in the verse: "and Al-Fitnah is worse than killing"? And what is meant by: "Thereupon, the disbeliever was dumbfounded"?

"Al-Irjaf" (spreading rumors) is delving into bad news and mentioning tribulations. The "Murjifun" (those who spread rumors) are the hypocrites. "Fitna" (persecution) in the verse means the attempts of the disbelievers to turn Muslims away from their religion, and it is worse than killing. The meaning of "Then he who disbelieved was confounded" is that he was confused, astonished, and his argument was cut off. This is in the story of the argument between Ibrahim (peace be upon him) and the disbelieving king.