Imam Malik's Muwatta, Chapter: Jumua

Yahya related to me from Malik from Nafi from Abdullah ibn Abi Bakr ibn Hazm from whoever related it to him that Abu Hurayra used to say, "It is better for a man to pray on the surface of al Harra (a rocky area in Madina) than for him to wait until the imam stands to give the khutba and then come and step over people's necks." Malik said, "The sunna with us is that the people face the imam on the day of jumua when he intends to give the khutba, whether they are near the qibla or elsewhere."