Prophet Muhammad sallallahu alayhi wa sallam said, there are three who supplication is never turned down, that do have a just a ruler and a fasting person when he breaks his fast and the supplication of the oppressed, Allah will raise it up to the clouds and the day of judgment and the gates of heaven will be open for it. And Allah says, I swear by my power and might, I will help you even if it is after some time.