Musannaf Ibn Abi Shayba 36:507

Khalid ibn Makhlad narrated to us, Sulayman ibn Bilal narrated to us, he said: Abd al-Rahman ibn Harmala narrated to me, he said: I heard Sa'id ibn al-Musayyib say: When the Messenger of Allah (may Allah bless him and grant him peace) passed away, he was placed upon his bed. The people would enter in groups, praying over him and leaving, and no one led them in prayer. He passed away on Monday and was buried on Tuesday.