al-Jarrah bin Malih bin 'Ady الجراح بن مليح بن عدي · The Book on Jana''iz (Funerals)

"When Malik bin Hubairah performed Salat for a funeral and the people were few he would divide them into three groups (rows) then say: 'The Messenger of Allah said: "For whomever three rows perform Salat, then it is granted."