Musnad Ahmad 32:1870

Ahmad ibn Abd al-Malik narrated to us, Abd al-Rahman ibn Abi al-Sahba’ narrated to us, Nafi’ Abu Ghalib al-Bahili narrated to us, he said: Anas ibn Malik narrated to me, he said: The Messenger of Allah (may Allah bless him and grant him peace) said: "The people will be resurrected on the Day of Resurrection while the sky is drizzling upon them."