Whoever has a sacrificial animal for slaughtering, once the crescent of Dhu al-Hijjah is declared, he should not cut anything of his hair or his nails until he sacrifices The Prophet (may Allah's peace and blessings be upon him) sacrificed two black and white horned rams. The Messenger (may Allah's peace and blessings be upon him) prayed on the Day of An-Nahr, then delivered a sermon, then slaughtered (an animal) and said: Whoever slaughtered before praying should slaughter another animal instead, and whoever has not yet slaughtered should slaughter while mentioning Allah's name Whoever can afford it but does not offer a sacrifice, let him not come near our prayer place The Prophet (may Allah's peace and blessings be upon him) delivered a sermon after having offered the prayer on Eid al-Ad'ha. He said: Whoever prayed our prayer and slaughtered our sacrifice has properly observed the ritual. And whoever slaughtered (his sacrifice) before the (Eid) prayer has not observed the ritual