"We performed the Nahr (sacrifice) with the Messenger of Allah (ﷺ) at Al-Hudaibiyyah: A camel for seven (persons) and a cow for seven (persons)."
Jami` at-Tirmidhi Book 19, Hadith 13
← Previous Hadith "We were with the Messenger of Allah (ﷺ) on a journey when the (Day of) Adha came, so we shared seven for a cow and ten for a camel."

Jami` at-Tirmidhi Book 19, Hadith 12 Next Hadith → "Ali said: 'A cow is for seven.' I said: "And if it gives birth?' He said: 'Then slaughter its offspring with it.' I said: 'What if it is lame?' He said: 'When it has reached the place of ritual.' I said: 'What if it has a broken horn?' He said: 'There is no harm, we were ordered' - or - 'The Messenger of Allah (ﷺ) ordered us, to check the two eyes and the two ears.'"

Jami` at-Tirmidhi Book 19, Hadith 14