صحيح البخاري Sahih Bukhari كتاب الأذان The Book of Adhan
بَابُ الإِقَامَةُ وَاحِدَةٌ، إِلاَّ قَوْلَهُ قَدْ قَامَتِ الصَّلاَةُ:

(3) Chapter. To pronounce the wording of Iqama once (in singles) except Qad-qamat-is-Salat.

1 hadith
Hadith 607
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ ، حَدَّثَنَا خَالِدٌ ، عَنْ أَبِي قِلَابَةَ ، عَنْ أَنَسٍ ، قَالَ : " أُمِرَ بِلَالٌ أَنْ يَشْفَعَ الْأَذَانَ وَأَنْ يُوتِرَ الْإِقَامَةَ " ، قَالَ إِسْمَاعِيلُ : فَذَكَرْتُ لِأَيُّوبَ ، فَقَالَ : إِلَّا الْإِقَامَةَ .
Narrated Abu Qilaba: Anas said, "Bilal was ordered to pronounce the wording of Adhan twice and of Iqama once only." The sub narrator Isma`il said, "I mentioned that to Aiyub and he added (to that), "Except Iqama (i.e. Qadqamat- is-salat which should be said twice).
Hadith Reference Sahih Bukhari / The Book of Adhan / Hadith: 607
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة