Abdullah bin Abi Najih عبد الله بن أبي نجيح · The Book of Funerals

"We never saw the Messenger of Allah attend any funeral where he sat down until (the body) was placed (in the grave)."

"Many people were wounded on the day of Uhud and complaints were made to the Messenger of Allah about that. He said: 'Dig graves and make them good and wide, and bury two or three in a grave, and put in first the one who knew the Qur'an most."'