وَالْبَدَنَةُ وَالْبَقَرَةُ تُجْزِئُ كُلُّ وَاحِدَةٍ مِنْهُمَا عَنْ سَبْعَةِ أَنْفُسٍ، إِذَا كَانَ كُلُّ وَاحِدٍ مِنَ الشُّرَكَاءِ يُرِيدُ الْقُرْبَةَ.
Translation: A camel or cow can suffice for seven participants, provided every participant intends worship and nearness to God.
Sab‘ah indicates up to seven prescribed shares. Qurbah means a worshipful intention.
Eligibility requires each participant to intend an act of worship. Writing seven names on a list is not a substitute if someone joins purely to buy meat.