Sayyiduna Abdullah bin Umar (may Allah be pleased with them) narrates that the Messenger of Allah (peace and blessings be upon him) said:“The gates of the heavens are opened for five things: (1) for the recitation of the Noble Qur’an, (2) at the time of battle between two groups, (3) at the time of rainfall, (4) for the supplication of the oppressed, (5) for the call to prayer (adhan).”