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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 625

Narrated Anas bin Malik:

"When the Mu'adh-dhin pronounced the Adhan, some of the companions of the Prophet (ﷺ) would proceed to the pillars of the mosque (for the prayer) till the Prophet (ﷺ) arrived and in this way they used to pray two rak`at before the Maghrib prayer. There used to be a little time between the Adhan and the Iqama." Shu`ba said, "There used to be a very short interval between the two (Adhan and Iqama).

حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ حَدَّثَنَا غُنْدَرٌ، قَالَ حَدَّثَنَا شُعْبَةُ، قَالَ سَمِعْتُ عَمْرَو بْنَ عَامِرٍ الأَنْصَارِيَّ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ الْمُؤَذِّنُ إِذَا أَذَّنَ قَامَ نَاسٌ مِنْ أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم يَبْتَدِرُونَ السَّوَارِيَ حَتَّى يَخْرُجَ النَّبِيُّ صلى الله عليه وسلم وَهُمْ كَذَلِكَ يُصَلُّونَ الرَّكْعَتَيْنِ قَبْلَ الْمَغْرِبِ، وَلَمْ يَكُنْ بَيْنَ الأَذَانِ وَالإِقَامَةِ شَىْءٌ‏.‏ قَالَ عُثْمَانُ بْنُ جَبَلَةَ وَأَبُو دَاوُدَ عَنْ شُعْبَةَ لَمْ يَكُنْ بَيْنَهُمَا إِلاَّ قَلِيلٌ‏.‏
Reference : Sahih al-Bukhari 625
In-book reference : Book 10, Hadith 22
USC-MSA web (English) reference : Vol. 1, Book 11, Hadith 598
  (deprecated numbering scheme)