Language:
كتاب الأذان
10  
Call to Prayers (Adhaan)
(14)
Chapter: How long should the interval between the Adhan and the Iqama be? (And something concerning) the person who wants for the Iqama
(14)
باب كَمْ بَيْنَ الأَذَانِ وَالإِقَامَةِ وَمَنْ يَنْتَظِرُ الإِقَامَةَ
Sahih al-Bukhari 624

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 ‏"‏‏.‏
Reference : Sahih al-Bukhari 624
In-book reference : Book 10, Hadith 21
USC-MSA web (English) reference : Vol. 1, Book 11, Hadith 597
  (deprecated numbering scheme)