Hadith 10:21
Narrated `Abdullah bin Mughaffal Al-Muzani:
Allah's Messenger (ﷺ) said thrice, "There is a prayer between the two Adhans (Adhan and Iqama)," and added, "For the one who wants to pray."
حَدَّثَنَا إِسْحَاقُ الْوَاسِطِيُّ، قَالَ حَدَّثَنَا خَالِدٌ، عَنِ الْجُرَيْرِيِّ، عَنِ ابْنِ بُرَيْدَةَ، عَنْ عَبْدِ اللَّهِ بْنِ مُغَفَّلٍ الْمُزَنِيِّ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " بَيْنَ كُلِّ أَذَانَيْنِ صَلاَةٌ ـ ثَلاَثًا ـ لِمَنْ شَاءَ "
Original Reference: Sahih al-Bukhari 624