Musannaf Ibn Abi Shayba 27:200

Ya'la ibn 'Ubayd narrated to us, he said: Isma'il ibn Abi Khalid narrated to us, from 'Amir, from 'Abdullah ibn al-Harith, from Ka'b, who said: "Indeed, Allah divided His speech and His vision between Musa and Muhammad, may Allah bless him and grant him peace. So Musa spoke to Him twice, and Muhammad saw Him twice."