Al-Sheikh Al-Sadouq states in Thawab Al-A'amal Book: Mohammad bin Muslim reported from Imam Abou Jaa'far (Pbuh) that he said: "For he who recites Al-Nahel Chapter every month, Allah will protect him from humiliation in Donia and seventy types of afflictions the least of them are Madness and Leprosy and his dwelling is Adan Heaven."
-Also stated in Tafseer Al-Ayashi Book-
Foqoh Al-Imam Al-Rida (Pbuh) Book: Imam Rida (Pbuh) said: " For he who recites Al-Nahel Chapter every month, Allah will protect him from seventy types of afflictions the least of them are Madness and Leprosy."
Al-Tabrasi states in Majma' Al-Bayan Book: The Messenger of Allah (Pbuh) said: "Allah doesn’t ask the bounties that He gave to he who recites this chapter. If one recited it and died in the same day or night he is rewarded as if he had a righteous will
