"The Messenger of Allah ﷺ said: 'Between each two Adhans [1] there is a prayer, between each two Adhans there is a prayer, between each two Adhans there is a prayer, for whoever wants to do it." [1]Meaning, between the Adhan and Iqamah. (Using translation from Nasāʾī 681)
قَالَ رَسُولُ اللهِ ﷺ عِنْدَ كُلِّ أَذَانَيْنِ صَلَاةٌ عِنْدَ كُلِّ أَذَانَيْنِ صَلَاةٌ عِنْدَ كُلِّ أَذَانَيْنِ صَلَاةٌ لِمَنْ شَاءَ