Fard (obligatory) prayer takes precedence over nafl (supererogatory) prayer, carries more weight, and it is greater in reward
Conclusion: Omitting prayer is one of the gravest of major sins that could bring about a person’s doom. Whoever omits a single prayer deliberately has exposed himself to the wrath, disgrace and punishment of Allah. No one knows how long any of the sinners among those who affirm the oneness of Allah will abide in hell, but they will vary in that regard.
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