Musnad Ahmad 28:420

'Abd al-Razzaq narrated to us, Ma'mar informed us, from al-Zuhri, from Ibn al-Musayyib, from 'Abdullah ibn 'Amr, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The equitable ones in the world will be upon pulpits of pearl on the Day of Resurrection, before Allah, the Almighty and Majestic, because they were equitable in the world."