Hazrat Hakeem-ul-Ummah (RA) has mentioned in Behishti Zewar under the chapter of fasting, that Allah سبحانه وتعالى will reward the people that kept their fasts by calling them under His throne and will say to them,

"O people that fasted in Ramadhan! You are Our guests because you kept your stomachs hungry despite food being readily available out of fear for Us. Come under the shade of Our throne, and a table spread shall be laid out for you."

(Ibn Abi Dunya , Kitab al-Joo')

On the day of judgment when people will be giving an account of their lives, and their brains will boil due to the heat of the sun being so near, a table spread shall be laid out for those who fasted the month of Ramadhan under the shade of Allah سبحانه وتعالى 's throne. There will be no reckoning of deeds under the shade of Allah سبحانه وتعالى 's throne, and where there will be reckoning of deeds, there shall be no shade there. Attaining the shade of Allah سبحانه وتعالى 's throne is a proof that Allah سبحانه وتعالى will not punish those people.