The Messenger صلى الله عليه وسلم said: “The first thing the people will be accountable for on the Day of Judgment is prayer, Allah will say to His angels (even though he already knows): “Look at my servants prayers. Were they complete or not?” If they were complete It will be written as complete. If they were not fully complete Allah will say: “See if my servant has voluntary prayers.” If he has them Allah will say: “Complete his obligatory prayers shortage with his voluntary prayers.” Then the rest of his deeds will be dealt with in the same manner.”

Reported by Imams Ahmad, Abu Dawood, An-Nisa’i, and Al-Hakim