It is permissible to share in the sacrifice, and a camel or a cow is sufficient for seven people Sahih Muslim 1318 e
Arabic hadith text
وَحَدَّثَنِي مُحَمَّدُ بْنُ حَاتِمٍ، حَدَّثَنَا مُحَمَّدُ بْنُ بَكْرٍ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، أَخْبَرَنَا أَبُو الزُّبَيْرِ، أَنَّهُ سَمِعَ جَابِرَ بْنَ عَبْدِ اللَّهِ، يُحَدِّثُ عَنْ حَجَّةِ النَّبِيِّ، صلى الله عليه وسلم قَالَفَأَمَرَنَا إِذَا أَحْلَلْنَا أَنْ نُهْدِيَ وَيَجْتَمِعَ النَّفَرُ مِنَّا فِي الْهَدِيَّةِوَذَلِكَ حِينَ أَمَرَهُمْ أَنْ يَحِلُّوا مِنْ . حَجِّهِمْ فِي هَذَا الْحَدِيثِ
Translation
Jabir b. 'Abdullah (Allah be pleased with them), describing the Hajj of Allah's Apostle (ﷺ) said
He (the Holy Prophet) commanded us as we had entered into the state of Ihram to sacrifice the animals (as a rite of Hajj) and a group (of person; amongst us, i. e. seven) shared in the sacrifice of one (camel or cow), and it happened at that time when he commanded them to put off Ihram for Hajj (after performing 'Umra).