Musannaf Ibn Abi Shaybah 5611 — The imam who is travelling and passes

Salih bin Sa'id says: I went out with Umar bin Abd al-Aziz to a place called al-Suwayda, staying out in the countryside. When the time of Jumu'ah came, the muezzin gave the call to prayer, and the people gathered pebbles and small stones (into a heap) for him. He stood and delivered the sermon and then led the two rak'ahs of Jumu'ah. Then he said: "The imam leads Jumu'ah wherever he may be."