Musnad Ahmad 1153:2222

Ishaq ibn Isa narrated to us, he said: Malik informed me, from Hisham ibn Urwah, from his father, from Aisha, that she said: When the Messenger of Allah (peace and blessings of Allah be upon him) arrived in Medina, Abu Bakr and Bilal were afflicted with fever. He then mentioned the hadith—meaning the hadith of Hammad—except that he did not mention the story of the newborn.