Sayyiduna Tamim al-Dari (may Allah be pleased with him) relates that the Messenger of Allah (peace and blessings be upon him) said: "The first thing for which a servant will be brought to account on the Day of Resurrection is his prayer. If he completed it, it will be recorded for him as complete. If he did not complete it, Allah, the Blessed and Exalted, will say to His angels: 'Do you find any voluntary prayers for My servant with which you can make up what he neglected of his obligatory prayer?' Then zakah will be dealt with likewise, and then all the other deeds in the same manner." Some of the companions of Hammad bin Salamah narrated it in abridged form, and Musa bin Isma'il is the authority on his hadith.