“He was killed how he plotted and then he was killed how he plotted”
Regarding the above verse, Imam Sadiq (as) said, “Leave Me (to deal) with him whom I created lonely” (Chapter 74 verse 11). “Lonely” means conceived illegitimately and it refers to Zufar.
“And gave him abundant wealth” (Chapter 74 verse 12) means that we gave him (Zufar) respite until a certain time.
“And sons living in his presence” (Chapter 74 verse 13) refers to (Zufar’s) companions who (all) testified that the Messenger of Allah (sawa) did not leave any inheritance behind.
“To whom I made (life) smooth and comfortable” (Chapter 74 verse 14) refers to (Zufar’s) government which was “smooth” for him.
“Yet he desires that I should give him more. Never. He has been stubborn to Our signs” (Chapter 74 verses 15-16). This means that (Zufar) denied the Wilayat of Ameerul Momeneen (as) and he was “stubborn” toward the Messenger of Allah (sawa) in accepting the Wilayat.
“Soon I will afflict him with a severe punishment. Verily he had thought and calculated” (Chapter 74 verses 17-18). This means that (Zufar) had plotted against the Wilayat of Ameerul Momeneen (as). He planned to dishonour the allegiance after the death of the Prophet (sawa), (the allegiance) that he had paid to the Commander of the Believers (as) during the life of the Prophet (sawa).
“He was killed how he plotted and then he was killed how he plotted” (Chapter 74 verses 19-20). This means that he will be punished again and again by the Qaem (as).
“Then he looked around” (Chapter 74 verse 21) means that (Zufar) looked at the Messenger of Allah (sawa) and the Commander of the Believers (as).
“Frowned and scowled” (Chapter 74 verse 22). He “frowned and scowled” because of what he was ordered to do (which was paying allegiance to the Commander of the Believers (as)).
“Then he turned his back and swelled with pride. And said: ‘This is nothing but sorcery of old” (Chapter 74 verses 23-24). This verse refers to when Zufar said, “The Prophet has bewitched the people with Ali.”
“Nothing but the word of a human being” (Chapter 74 verse 25) refers to Zufar’s words (when he said), “(Paying allegiance to Ali) was not revealed to Mohammed (sawa) by Allah.”
“Soon I will cast him in the fire of Hell” (Chapter 74 verse 26). And this is also revealed about him. (Tafseer Al Qummi volume 2 page 395)