Hisham bin Urwah narrates from his father that Sayyidah Aishah (may Allah be pleased with her) said: Jamilah was the wife of Aws bin al-Samit (may Allah be pleased with him), and Aws was a man afflicted with a touch of madness; when his illness intensified, Aws made zihar from his wife, so Allah, Lord of Might, revealed the expiation for zihar.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الظهار / 15244