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The Pillars of Prayer and its conditions of validity
There are five prayers which must be performed by the Muslims and are called obligatory prayers. It is a great sin to neglect performing any of these obligatory prayers.
https://www.islam.ms/en/?p=57How to Perform the Five Obligatory Prayers
There are five prayers which must be performed by the Muslims and are called obligatory prayers. They are Dhuhr (Noon) prayer, `Asr (afternoon) prayer, Maghrib (sunset) prayer, `Ishaa’ (Nightfall) prayer and Fajr (Dawn) prayer. It is a great sin to neglect performing any of these obligatory prayers. Among the merits of performing the obligatory prayers is that one’s small sins, which may be committed between prayers, are forgiven.
https://www.islam.ms/en/?p=61