صحيح البخاري
Sahih Bukhari
كتاب الأذان
The Book of Adhan
بَابُ كَمْ بَيْنَ الأَذَانِ وَالإِقَامَةِ وَمَنْ يَنْتَظِرُ الإِقَامَةَ:
(14) Chapter. How long should the interval between the Adhan and the Iqama be? (And something concerning) the person who waits for the Iqama.
2 hadith
Hadith 624
Narrated `Abdullah bin Mughaffal Al-Muzani: Allah's Apostle said thrice, "There is a prayer between the two Adhans (Adhan and Iqama)," and added, "For the one who wants to pray."
Hadith 625
Narrated Anas bin Malik: "When the Mu'adh-dhin pronounced the Adhan, some of the companions of the Prophet would proceed to the pillars of the mosque (for the prayer) till the Prophet 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).