Musannaf Ibn Abi Shaybah 31756 — What a man says in supplication when

Abu Ishaq said that al-Hakam said: Whoever hears the caller announcing the establishing of the prayer, let him supplicate thus: "O Allah, Lord of this complete call and of the prayer that is being established, grant Muhammad his request on the Day of Resurrection." Because of this, intercession will be made for him.