📖 Abu Huraira RadhiAllahu 'anhu narrated: Allah's noble Messenger Muhammad SallAllahu 'alaihi wa sallam said, "The first action for which a servant of Allah will be held accountable on the Day of Resurrection will be his prayers. If they are in order, he will have prospered and succeeded. If they are lacking, he will have failed and lost. If there is something defective in his obligatory prayers, then Allah the Almighty will say: 'See if My servant has any voluntary prayers that can complete what is insufficient in his obligatory prayers.' The rest of his deeds will be judged the same way."
Source: Sunan At-Tirmidhi 413
Grade: Sahih (Authentic) according to Al-Albani