One who delays the prayer from its time intentionally, then prays it
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Question:
And one of the things is that a person was negligent in his prayer and did not pray it until its time had passed. So you exposed his negligence, and he was negligent, then he prayed it. Does this constitute a major sin?
Answer:
The majority hold that he does not become a disbeliever; he commits a great sin by doing so, but his prayer is valid, and he should repent to Allah the Exalted. However, if he persists in this, it is a great danger. Some scholars hold that he becomes a disbeliever, because the Messenger (peace and blessings be upon him) said regarding one who forgets a prayer or sleeps through it that he should pray it when he remembers it, and there is no expiation for it except that. The Prophet (peace and blessings be upon him) did not mention anyone except the one who forgets and the one who sleeps, which indicates that the one who does it intentionally does not make it up. And if he does not make it up, that indicates that he has committed disbelief by doing so. The issue is very serious, but the majority hold that he does not become a disbeliever by it, but he commits a great sin, and he must repent and be careful to maintain the prayer. The danger is severe. Yes.
And one of the things is that a person was negligent in his prayer and did not pray it until its time had passed. So you exposed his negligence, and he was negligent, then he prayed it. Does this constitute a major sin?
Answer:
The majority hold that he does not become a disbeliever; he commits a great sin by doing so, but his prayer is valid, and he should repent to Allah the Exalted. However, if he persists in this, it is a great danger. Some scholars hold that he becomes a disbeliever, because the Messenger (peace and blessings be upon him) said regarding one who forgets a prayer or sleeps through it that he should pray it when he remembers it, and there is no expiation for it except that. The Prophet (peace and blessings be upon him) did not mention anyone except the one who forgets and the one who sleeps, which indicates that the one who does it intentionally does not make it up. And if he does not make it up, that indicates that he has committed disbelief by doing so. The issue is very serious, but the majority hold that he does not become a disbeliever by it, but he commits a great sin, and he must repent and be careful to maintain the prayer. The danger is severe. Yes.
Source
شرح بلوغ المرام من أدلة الأحكام [ صالح الفوزان ]، تتمة باب صلاة التطوع — islamhouse.com (1:00:43)
The Arabic text is a machine transcription of the audio recording.