And Zuhayr ibn Harb narrated to me, saying: 'Abd al-Rahman ibn Mahdi narrated to us, saying: Mahdi ibn Maymun narrated to us, from Ghaylan, from 'Abd Allah ibn Ma'bad al-Zimmani, from Abu Qatada al-Ansari, may God be pleased with him, that the Messenger of God, peace and blessings be upon him, was asked about fasting on Monday, and he said: "On it I was born, and on it the revelation was sent down upon me."