Holy Prophet Muhammad al Mustafā (salla llāhu ʿalayhi wa-alehe wa-sallam) said:
"On the Night of Power the gates of Heaven are opened. There for every is no servant who offers prayer in this night, but Allāh for every prostration stores a tree in the Paradise - the tree whose branches and shade is so vast that if a rider travels for one hundred years through its shade he would not be able to cross it; for every ra'kat would build a home for him in Paradise - the home decorated and built by pearls, topaz, and rubies; for every verse recited a crown from the crowns of Paradise; for every praise (tasbeeh) a bird from the birds of Paradise; for every sitting a rank from the ranks of Paradise; for every witnessing (tashahud) - a chamber from the chambers of Paradise, and for every salutation - a robe from the robes of Paradise would be bestowed upon him by Allāh. And at the breaking of the dawn, companions - youthful and sympathetic, houris of Paradise - pure and decorated, servant obedient and well uniformed, horses - most obedient and swift, flowers, greenery, and good smells, running elegant fountain streams, and many other bounties which make the soul pleased and eyes to shine, would also be bestowed upon him by Allāh."
[Reference: Spiritual Journey of the Mystics, Chapter 9. Night of Power (Lailatul-Qadr)]
Imām Mūsá ibn Ja‘far al-Kāzim (alayhi salām) said:
"One, who performs the ghusl on the Night of Qadr and remains awake in it (engaged in worship), shall have all his sins forgiven."
[Reference: Wasaail al-Shia'h, vol. 10, pg. 358]
REWARD FOR 22nd DAY OF FASTING
Holy Prophet Muhammad al Mustafā (salla llāhu ʿalayhi wa-alehe wa-sallam) said:
"...The reward of the twenty-second day is that Allāh would send the Angel of death to you in the same way as He sends him to the prophets. He would take away the fear of Munkir and Nakir from you and keep away the sorrow of this world and the chastisement of the grave......"
[Reference: Sawaabul A’amaal, page 105-106]