Musnad Ahmad 175:20

Yazid ibn Abd Rabbih narrated to us, he said: Muhammad ibn Harb narrated to me, he said: al-Zubaydi narrated to me, from al-Zuhri, from Abd al-Rahman ibn Abd Allah ibn Ka'b ibn Malik, from Ka'b ibn Malik, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "People will be resurrected on the Day of Resurrection, and I and my nation will be upon a hill. My Lord, Blessed and Exalted is He, will clothe me in a green garment. Then permission will be granted to me, and I will say what Allah wills that I say. That is the Praiseworthy Station (al-Maqam al-Mahmud)."