Yahya bin Saeed reported,

I have been told that the first thing examined from a servant's deeds is the prayer. If it is accepted from him, the rest of his deeds are then examined. But if it is not accepted from him, nothing else of his deeds is examined at all.

و حدثني عن مالك

عن يحيى بن سعيد أنه قال

بلغني أن أول ما ينظر فيه من عمل العبد الصلاة فإن قبلت منه نظر فيما بقي من عمله وإن لم تقبل منه لم ينظر في شيء من عمله