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"Say (O Muhammad sal-Allaahu 'alayhe wa sallam): My Lord has commanded justice and (said) that you should face Him only (i.e, worship none but Allaah and face the Qiblah, i.e, the Ka'bah at Makkah during prayers) in each and every place of worship, in prayers (and not to face other false deities and idols), and invoke Him only making your religion sincere to Him by not joining in worship any partner to Him and with the intention that you are doing your deeds for Allaah's sake only, As He brought you (into being) in the beginning, so shall you be brought into being (on the Day of Resurrection) [in two groups, one as a blessed one (believers), and the other as a wretched one (disbelievers)]." [Al-A'raaf (7):29]

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]