Ibn Babawaih states in Thawab Al-A'amal Book: Moawia bin Ammar reported from Imam Abou Abdellah (Pbuh) that he said: "He who recites Al-Shams, Al-Lail, Al-Doha and Al-Inshirah Chapters frequently in a night or during a day, everything that was present with him will testify for him on Resurrection Day even his hair, skin, flesh, blood, veins, nerves and bones along with everything that the ground carried for him. Then Allah will say: "Your testimony for My servant is accepted. Take him to My heavens so that he chooses what he pleases and give it to him out of My mercy and virtue. Congratulations to my servant."
Al-Tabrasi states in Majma' Al-Bayan Book: The Messenger of Allah (Pbuhp) said: "He who recites Al-Shamess Chapter is as if he gave for charity every matter above which the sun and moon shined."
Khawas Al-Quran Book: The Messenger of Allah (Pbuhp) said: "He who recites Al-Shamess Chapter is as if he gave for charity every matter above which the sun and moon shined. He who always doesn't succeed in matters, Allah allows him to succeed if he recited it constantly. It increases the memory, the acceptance of people and highness."
Khawas Al-Quran Book: Imam Sadiq (Pbuh) said: "Reciting it constantly is good for the ones who don’t earn a lot of livelihood and who always suffer from losses and sorrows. By that they earn success and more livelihood. Drinking its water makes tremors go."