Riyad us Saliheen: Hadith 1156

Abdullah bin 'Umar (May Allah be pleased with them) said to me: "Did you hear your father narrating something from the Messenger of Allah (ﷺ) about the special moment during Friday?" I said: "Yes, I heard him report from the Messenger of Allah (ﷺ): 'It occurs between the time when the Imam sits down (on the pulpit after the first Khutbah) and the time Salat is over."'

[Muslim].