When a person slaughters a Qurbani animal, he is forgiven at the fall of the first drop of blood, and verily, the animal shall be brought forward on the Day Of Judgement with its blood, meat etc., and shall be increased in weight seventy times more than its own weight, and thereafter it will be placed on the scale of deeds. (Kanzul ‘Ummaal).

"The one who does not perform sacrifice even though he can, should not join us in the `Id Prayer". (Musnad Ahmad, Ibn Majah).