The sacrificial camels we have made for you as among the symbols from Allah. In them is (much) good for you: then pronounce the name of Allah over them as they line up (for sacrifice): when they are down on their sides (after slaughter), eat ye thereof, and feed such as (beg not but) live in contentment, and such as beg with due humility: thus have We made animals subject to you, that ye may be grateful. It is not their meat nor their blood that reaches Allah. it is your piety that reaches Him: He has thus made them subject to you, that ye may glorify Allah for His Guidance to you and proclaim the good news to all who do right.( Al-Quran 22:36-37)

And, when he (his son) was old enough to walk with him, he said: "O my son! I have seen in a dream that I am slaughtering you (offer you in sacrifice to Allah), so look what you think!" He said: "O my father! Do that which you are commanded, Insha' Allah (if Allah will), you shall find me of As-Sabirin (the patient ones, etc.)." Then, when they had both submitted themselves (to the Will of Allah), and he had laid him prostrate on his forehead. And We called out to him: "O Abraham! You have fulfilled the dream (vision)!" Verily! Thus do We reward the Muhsinun (good-doers).Verily, that indeed was a manifest trial. And We ransomed him with a great sacrifice (i.e. a ram). And We left for him (a goodly remembrance) among generations (to come) in later times. (Al-Quran 37:102-108.)

Narrated Anas bin Malik: The Prophet (PBUH) said, "Whoever slaughtered the sacrifice before the prayer, he just slaughtered it for himself, and whoever slaughtered it after the prayer, he slaughtered it at the right time and followed the tradition of the Muslims."  (Sahih Bukhairi, Book 68, hadith#454)

Sayyidah Ayshah (RA) narrated that Allahs Messenger (PBUH)  said, “Of the deeds a man does on the day of sacrifice the dearest to Allah is the flow of blood (sacrifice). It will come on
the day of Resurrection with its horns and its hair and its hoofs. Indeed, blood will be
accepted by Allah at once even before it falls on the ground. So, please yourselves with
it!

[Ibn e Majah 3126]

It was reported that the Prophet Muhammad (PBUH) said:
The first thing that we do on the day of Eid is to perform the prayers. Then we go home and carry out our Qurbani. Thus whoever does those acts has conformed to our sunnah. And for those who slaughtered  before it, then the meat is for the family members and not as an act of Qurbani. (Sahih Al-Bukhari, Book 15, Number 82)

Narrated Jabir ibn Abdullah: The Prophet (PBUH) said: A cow serves for seven, and a camel serves for seven.  (Sunan Abu Dawud,Book15, hadith#2802)