Abdullah Bin Ammar radhiallahu anhu states that Nabi sallallahu alayhi wasallam said:
"The fast and the Quraan will both plead on behalf of the bondsmen who keeps fast in the day and recites or listens attentively to the recitation of the Quraan at night standing in the presence of Allah (in taraweeh). The fast will say "O my Lord, I had held him back from food, drink and sexual gratification, accept my intercession for him today and treat him with mercy and forgiveness. The Quraan will say, "I had held him back from taking rest and sleep at night, O’ my Lord, accept my intercession for him today and treat him with mercy and forgiveness". The intercession of both the fast and Quraan will be accepted and he will be treated with exceptionl kindness". (Baihaqi).
Sayyidina Abu Sa’eed Al-Khudree radhiallahu anhu narrates that Sayyidina Rasoolullah sallallahu alayhi wasallam said:
"When the first night of Ramadhaan dawns (comes), the doors of the skies are opened, and none of its doors are then closed until the last night of Ramadhaan.
No mu’min servant (of Allah) performs salaah during its night (any night of Ramadhaan), but Allah will record for him one thousand five hundred hasanah (rewards) for every sajdah that he makes. And Allah will build a home for him in Jannah made out of red ruby, which will have sixty thousand doors, each of its doors having (interlinked to, leading to) a palace made out of gold, ornamented (beautified and decorated) with rubies.
Thus, when he (the mu’min) fasts on the first day of Ramadhaan, all his past sins are pardoned, and seventy thousand malaaikah make istighfaar for him, daily, from the time of the fajr salaah, until the sun sets.
And for every sajdah that he makes during Ramadhaan, either by day or by night, there will be for him a tree, (in Jannah, so huge that) a person on horseback will ride in its shade for five hundred years." (Baihaqi, Targheeb)