Ever hear of the Last Supper? Look it up.
The apostles did not offer a sacrifice at the Last supper or any where else in the scriptures...
Pro 6:16 These six things doth the LORD hate: yea, seven are an abomination unto him:
Pro 6:17 A proud look, a lying tongue, and hands that shed innocent blood,
Pro 6:18 An heart that deviseth wicked imaginations, feet that be swift in running to mischief,
Pro 6:19 A false witness that speaketh lies, and he that soweth discord among brethren.
http://matt1618.freeyellow.com/sacrifice.html#The Institution of the Eucharistic Sacrifice