Weak (da'if) — scholars do not use this report as evidence for rulings.
Narrated Imran ibn Husayn: I went on an expedition with the Messenger of Allah (ﷺ), and I was present with him at the conquest. He stayed eighteen days in Mecca and prayed only two rak'ahs (at each time of prayer). And he said: You who live in the town must pray four; we are travellers