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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 'Abdullah bin Amr bin Al 'Aas:

Allah's Apostle stopped (for a while near the Jimar) at Mina during his last Hajj for the people and they were asking him questions. A man came and said, "I forgot and got my head shaved before slaughtering the Hadi (sacrificing animal)." The Prophet said, "There is no harm, go and do the slaughtering now." Then another person came and said, "I forgot and slaughtered (the camel) before Rami (throwing of the pebbles) at the Jamra." The Prophet said, "Do the Rami now and there is no harm." The narrator added: So on that day, when the Prophet was asked about anything (as regards the ceremonies of Hajj) performed before or after its due time, his reply was: "Do it (now) and there is no harm." [The Book of Knowledge Volume 1, Book 3, Hadeeth 83]