Musnad Abu Ya'la al-Mawsili 153:133

Ishaq narrated to us, Abd al-Aziz ibn Muhammad narrated to us, Ma'mar narrated to us, from al-Zuhri, from Salim, from his father, who said: The Messenger of Allah (may Allah bless him and grant him peace) cursed, during the morning prayer, so-and-so and so-and-so, people from among the hypocrites. Then Allah the Exalted revealed: "Not for you is the decision whether He turns in mercy to them or punishes them, for they are indeed wrongdoers."