Musnad Abu Ya'la al-Mawsili 54:9

Narrated to us Muhriz ibn 'Awn, narrated to us Rushdin ibn Sa'd, from Zabban ibn Fa'id, from Sahl ibn Mu'adh, from his father, from the Prophet, peace and blessings of Allah be upon him, who said: "Whoever steps over people on the day of Friday, he has taken a bridge to Hell."