Hadith.1374 - Jabir ibn Isma'il narrated from Ja'far ibn Muhammad, from his father (as), that a man asked Ali ibn Abi Talib (as) about praying during the night with recitation. Ali (as) said to him, "Rejoice! Whoever prays a tenth of the night for the sake of Allah (swt) with sincerity, seeking His reward, Allah (swt), Blessed and Exalted, will say to His angels: 'Write for My servant the good deeds equal to every seed, leaf, and tree that grows in the night, and the number of every stalk, frond, and pasture.' Whoever prays a ninth of the night, Allah (swt) grants him ten answered supplications and gives him his book (record) in his right hand. Whoever prays an eighth of the night, Allah (swt) grants him the reward of a patient martyr with sincere intention, and he will intercede for his family. Whoever prays a seventh of the night will rise from his grave on the Day of Resurrection with a face as bright as the full moon and cross the Sirat (bridge) with the secure ones. Whoever prays a sixth of the night is counted among the Awabin (those who frequently turn to Allah (swt) in repentance), and their past sins are forgiven. Whoever prays a fifth of the night will be beside Ibrahim (as), the Friend of the Merciful, in his dome. Whoever prays a fourth of the night will be among the first to succeed and cross the Sirat like a fierce wind, entering Paradise without reckoning. Whoever prays a third of the night will have all the angels envy his rank with Allah (swt) and be told, 'Enter any of the eight gates of Paradise you wish.' Whoever prays half the night would not find the equivalent of his reward even if given the earth's fill in gold seventy thousand times, and it would be better than freeing seventy slaves from the descendants of Isma'il (Ishmael). Whoever prays two-thirds of the night will have good deeds equivalent to the grains of sand in Alij [a desert area that has a lot of sand], and even the least of them is heavier than Mount Uhud ten times. Whoever prays an entire night reciting the Book of Allah (swt), bowing, prostrating, and remembering Him will be given such a reward that he emerges from his sins like the day he was born, with good deeds equal to all that Allah (swt) has created and the same in degrees. Light will be established in his grave, envy and sin will be removed from his heart, he will be protected from the punishment of the grave, and he will be granted freedom from the Fire. He will be resurrected among the secure, and Allah (swt), Blessed and Exalted, will say to His angels: 'Look at My servant who spent his night seeking My pleasure. Make him dwell in Firdaws (the highest part of Paradise), where he will have one hundred thousand cities, each containing all that souls desire and eyes delight in and more, beyond what has ever crossed the heart of anyone, prepared for him as an honor and increase and closeness to Me.'"
Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.