Musnad Ahmad 1187:0

Narrated Umm Ma'bad al-Juhaniyyah: The Messenger of Allah (ﷺ) recited "Qaf. By the Glorious Qur'an" (Surah Qaf) upon the minbar on Fridays, as he used to recite it frequently on the minbar. She said: My taking of the "Qaf" (Surah) from him was only due to his frequent recitation of it on the minbar every Friday.