Is it permissible for three or four people to share in an Udhiyah if it is a large animal (badanah), or must they be seven?

A condition for sharing in the sacrifice of a camel or a cow is that the share of the sacrificer must not be less than one-seventh. There is no harm if two, three, or more people share in the sacrifice of a cow or a camel, as long as they do not exceed seven. It is also permissible for one person to sacrifice a cow or a camel.