468.Hadhrat Abu Saeed Khudri (Allah be pleased with him) narrates that Muhammad (peace be upon him) said: "The doors of the Heavens are opened up on the first night of Ramadhan. Not a single Door (among the Doors of Heaven) is then closed until the last night of Ramadhan. For every Salaat performed (this refers to Taraweeh Salaat) during the nights of Ramadhan, Allah Ta'ala records one and a half thousand good deeds for every Sajdah (of the Salaat). And, for the fasting person, Allah Ta'ala creates in Jannat a mansion of red Ya'koot (a precious stone in Jannat). This mansion will have seven thousand entrances. (So huge will these entrances be that in each entrance will be located) a palace of gold adorned with red Ya'koot. When the Muslims fast the first day if Ramadhan, Allah Ta'ala forgives all his sins committed from the first of the previous Ramadhan. Daily (i.e. during Ramadhan) from the time of Fajr Salat until sunset, seventy thousand Malaaikah supplicate for his forgiveness. In return for every Sajdah which he (the fasting person) makes, of any Salat, whether during the day or night, he will obtain (such a wonderful) tree (so huge) that a horseman will take five hundred years to pass under its shade."
(Baihaqi).
(Hayaat-ul-Muslimeen. by Mohammad Ashraf Ali Thanvi).