Four-rak'ah sunnah prayers should be prayed two by two

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Al Sunnan Al Rawatib (Sunnah Prayers associated with Fardh Prayers)
Praying Taraaweeh in congregation in Ramadaan is Sunnah and not a bid’ah (innovation)

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Related Answers:
Can he pray two rak‘ahs with more than one niyyah (intention)?
Is the Sunnah prayer before Zuhr two rak’ahs or four rak’ahs?
Making up naafil acts of worship
Al Sunnan Al Rawatib (Sunnah Prayers associated with Fardh Prayers)
Praying Taraaweeh in congregation in Ramadaan is Sunnah and not a bid’ah (innovation)

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