Those who said: the first thing a servant will be called to account for is the prayer

Al-Hasan said: Sayyiduna Abu Hurayrah (may Allah be pleased with him) met a man and said to him: "You do not seem to be from this town." He said: "Yes." Sayyiduna Abu Hurayrah said: "Shall I not narrate to you a hadith of the Messenger of Allah (peace and blessings be upon him) that will benefit you? I heard the Messenger of Allah (peace and blessings be upon him) say: 'On the Day of Resurrection, the first thing to be reckoned will be the prayer. If it turns out to be complete, well and good; otherwise it will be said to the angels: Make up the shortfall in his prayer from his voluntary prayers.'" Al-Hasan said: The same will be done with the rest of his deeds.

Sayyiduna Tamim al-Dari (may Allah be pleased with him) said: On the Day of Resurrection, the first thing to be reckoned will be the prayer. If the prayer turns out to be complete, well and good; otherwise it will be said to the angels: "Look at his voluntary prayers; if he has voluntary prayers, make up the shortfall in his obligatory prayers from his voluntary prayers."

Tamim bin Salamah said: On the Day of Resurrection, the first thing to be reckoned will be the prayer. If the prayer is accepted, the rest of the deeds will also be accepted, and if the prayer is rejected, the rest of the deeds will also be rejected.