Salim bin 'Abdullah bin 'Umar سالم بن عبد الله بن عمر بن الخطاب · The Book on Sacrifices

"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."

"The Messenger of Allah (ﷺ) delivered a sermon to us on the Day of Nahr and he said: 'None of you should slaughter until he performs the Salat." He said: 'So my maternal uncle stood and said: ' O Messenger of Allah, this is the day in which meat is disliked, and I hastened my sacrifice to feed my family and the people of my dwellings - or - 'my neighbors.' He said: 'Repeat your slaughter with another.' He said:…