Musnad Ahmad 30:2336

Harun narrated to us, he said: Ibn Wahb narrated to us, he said: Amr ibn al-Harith narrated to us, that Abu Yunus, the freed slave of Abu Hurayrah, narrated to him from Abu Hurayrah, from the Messenger of Allah, may Allah bless him and grant him peace, that he said: "Allah, the Almighty and Majestic, does not send down a blessing from the sky, except that by morning a group of people become disbelievers in it. Allah, the Almighty and Majestic, sends down the rain, and they say: 'By such-and-such star.'"