Majma al-Zawaid — Hadith 3016

Sayyiduna Awf bin Malik (may Allah be pleased with him) narrates: I hope that the hour (of acceptance) is one of three times on the day of Friday: when the mu'adhdhin gives the call to prayer, as long as the imam remains on the pulpit, and at the time of the iqamah.
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains a narrator, Abdullah bin Salih, about whose use as evidence there is disagreement.