Musannaf Ibn Abi Shayba 16:971

Abu Bakr narrated to us, he said: Isa ibn Yunus narrated to us, from Abd al-Rahman ibn Yazid, from Makhul, who said: There was a ram depicted on the shield of the Prophet, may Allah bless him and grant him peace. This weighed heavily upon him, and he woke up in the morning, and Allah had removed it.