Jaʿfar, from ʿUmārah ibn Ghaziyyah, from Khubayb ibn ʿAbd al-Raḥmān ibn Isḥāq, from Ḥafṣ ibn ʿĀṣim ibn ʿUmar ibn al-Khaṭṭāb, from his father, from his grandfather ʿUmar.

Second ḥadith: Muʿāwiyah ibn Abī Sufyān—numerous routes go back to him.

1 – ʿAlqamah ibn Waqāṣ relates that Muʿāwiyah heard the muʾadhdhin proclaim, “Allāhu akbar, Allāhu akbar,” so Muʿāwiyah responded, “Allāhu akbar, Allāhu akbar.” The muʾadhdhin then said, “Ashhadu an lā ilāha illā Allāh,” and Muʿāwiyah repeated, “Ashhadu an lā ilāha illā Allāh.” Next the muʾadhdhin said, “Ashhadu anna Muḥammadan rasūl Allāh,” and Muʿāwiyah echoed him. When the muʾadhdhin called out, “Ḥayya ʿala al-ṣalāh,” he answered, “La ḥawla wa la quwwata illā billāh.” When the muʾadhdhin called out, “Ḥayya ʿala al-falāḥ,” he again replied, “La ḥawla wa la quwwata illā billāh.” The muʾadhdhin then concluded, “Allāhu akbar, Allāhu akbar; lā ilāha illā Allāh,” and Muʿāwiyah concluded in exactly the same words. He then added, “This is precisely how the Messenger of Allah ﷺ used to do.”

Al-Dārimī and al-Ṭaḥāwī recorded this route through Saʿīd ibn ʿĀmir, who said: “Muḥammad ibn ʿAmr narrated to us, from his father, from his grandfather,” with the same content.

It was also collected by Aḥmad and Ibn Khuzaymah—as cited in Fatḥ al-Bārī—through the route of Yaḥyā al-Qaṭṭān from Muḥammad ibn ʿAmr, except that the wording there is: “He said: Allāhu akbar—and he replied: Allāhu akbar; then he said: lā ilāha illā Allāh—and he replied: lā ilāha illā Allāh,” thus separating the declaration of monotheism from the two opening takbīrs.