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"Say (O Muhammad sal-Allaahu 'alayhe wa sallam): "Who is the Lord of the heavens and the earth?" Say: "(It is) Allaah." Say: "Have you then taken (for worship) Awliyaa' (protectors, etc.) other than Him, such as have no power either for benefit or for harm to themselves?" Say: "Is the blind equal to the one who sees? Or darkness equal to light? Or do they assign to Allaah partners who created the like of His creation, so that the creation (which they made and His creation) seemed alike to them." Say: "Allaah is the Creator of all things, He is the One, the Irresistible."" [Ar-Ra'd (13):16]

Narrated Abu Huraira:

Allah's Apostle said, "(A believer) who accompanies the funeral procession of a Muslim out of sincere faith and hoping to attain Allah's reward and remains with it till the funeral prayer is offered and the burial ceremonies are over, he will return with a reward of two Qirats. Each Qirat is like the size of the (Mount) Uhud. He who offers the funeral prayer only and returns before the burial, will return with the reward of one Qirat only." [The Book of Faith Volume 1, Book 2, Hadeeth 45]