Ibn 'Abbas said, " 'Umar said, 'Let us go forth to the land of our people.' Ubayy ibn Ka'b and I were at the back of the people. A cloud gathered. Ubayy said, 'O Allah, remove its harm from us!' We met the people and their mounts were wet. They said, 'What fell on us did not fall on you!' I said, 'He asked Allah Almighty to remove its harm from us.' 'Umar said, 'Why didn't you include us in your supplication?'"