I would like to know whether it is obligatory to offer a sacrifice every year during ‘Eid al-Adha?

 

The udhiya (the animal sacrifice) is an established sunnah. Whoever acts upon it will be rewarded and whoever refrains from performing it will not be blameworthy. It is not obligatory for a person who used to offer the udhiya every year to continue to do so. However, it is recommended to observe this sunnah if it is affordable for it entails a great reward.

And God Almighty knows best.