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"O you who believe! When believing women come to you as emigrants, examine them, Allaah knows best as to their Faith, then if you ascertain that they are true believers, send them not back to the disbelievers, they are not lawful (wives) for the disbelievers nor are the disbelievers lawful (husbands) for them, But give the disbelievers that (amount of money) which they have spent [as their Mahr] to them, And there will be no sin on you to marry them if you have paid their Mahr to them, Likewise hold not the disbelieving women as wives, and ask for (the return of) that which you have spent (as Mahr) and let them (the disbelievers, etc.) ask back for that which they have spent, That is the Judgement of Allaah, He judges between you, And Allaah is All-Knowing, All-Wise." [Al-Mumtahanah (60):10]

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]