It is narrated from a Companion (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The first thing for which a servant will be called to account is his prayer. If he has performed it completely, it will be recorded as complete. Otherwise, Allah Almighty will say: 'See if My servant has any voluntary prayers, so that the obligatory prayers may be completed through them.' The same will be done with zakat, and the reckoning of other deeds will also be in this manner."