Musannaf Ibn Abi Shaybah 8477 — The shepherd combining two prayers

Abd al-Rahman bin Harmalah said: A man came to Sa'id bin al-Musayyib and said: I am a herdsman of camels. I go looking for them, and when evening comes I pray Maghrib. Then I lie down to rest and fall asleep before the Isha prayer. He said: Do not sleep before you have prayed Isha; if you fear you will fall asleep, then combine the two prayers.