A companion narrates that the Messenger of Allah, peace and blessings be upon him, said: On the Day of Judgment, the first thing about which a person will be questioned is the prayer. If the prayer is complete, it is good; if it is not complete, Allah Almighty will say: Look to see if there are any voluntary prayers in his record of deeds. Through the voluntary prayers, the deficiency in the obligatory prayers will be fulfilled. Then the reckoning of zakat will take place. Then the rest of the deeds will be accounted for in the same manner.