The Blood Sacrifice offered on the day of 'Id al-Adha'
The jurists disagree about sacrifices whether they are obligatory or are a sunna. Malik and al-Shafi'i held that it is one of the sunna mu'akkada (emphatic sunna). Malik made an exemption in the case of the pilgrim for relinquishing it at Mina. Al-Shafi'i did not make distinction between pilgrims and others
Abu Hanifa's said that the sacrifice is obligatory for those residents of the cities who can afford it,
and that it is not obligatory for travellers. He was opposed in this by his two disciples Abu Yusuf and Muhammad who maintained that it is not obligatory (but is a sunna). The same opinion as Abu Hanifa's is also related from Malik Bidayat al Mujtahid The Distinguished Jurist's Primer by Ibn Rush-