Eating Something Sacrificed To Fulfill An Oath
Anything halal for consumption does not automatically become haram just because of an oath. It really depends upon your intention at the time of making the oath. If you intended that you would distribute the whole meat then you should not eat from it yourself. Similarly, if you did not have anything particular in mind then implicitly your oath perhaps meant that you would distribute the whole offering. However, if you intended that you would make a sacrifice and then invite others to share a meal with you then obviously you can eat from it as well. What is important is that you completely fulfill your oath with utmost sincerity according to your intentions at the time of making the oath.