"At the time of the Messenger of Allah ﷺ the phrases of the Adhan were said twice and the phrases of the Iqamah were said once, except that you should say: 'Qad Qamatis-Salah, Qad Qamatis-Salah (prayer is about to begin, prayer is about to begin).'"  

كَانَ الأَذَانُ عَلَى عَهْدِ رَسُولِ اللَّهِ ﷺ مَثْنَى مَثْنَى وَالإِقَامَةُ مَرَّةً مَرَّةً إِلاَّ أَنَّكَ تَقُولُ قَدْ قَامَتِ الصَّلاَةُ قَدْ قَامَتِ الصَّلاَةُ  

"At the time of the Messenger of Allah ﷺ the phrases of the Adhan were said twice and the phrases of the Iqamah were said once, except that you should say: 'Qad Qamatis-Salah, Qad Qamatis-Salah (prayer is about to begin, prayer is about to begin).'" (Using translation from Nasāʾī 628)  

كَانَ الْأَذَانُ عَلَى عَهْدِ النَّبِيِّ ﷺ مَثْنَى مَثْنَى وَالْإِقَامَةُ مَرَّةً إِلَّا أَنَّكَ تَقُولُ قَدْ قَامَتِ الصَّلَاةُ قَدْ قَامَتِ الصَّلَاةُ  

[Machine] "Except for him giving the Adhan and leading the Iqamah, no one should say, 'The prayer has been established, the prayer has been established.'"  

أَنْ يَشْفَعَ الْأَذَانَ وَيُوتِرَ الْإِقَامَةَ إِلَّا قَوْلَهُ قَدْ قَامَتِ الصَّلَاةُ قَدْ قَامَتِ الصَّلَاةُ  

[Machine] "He says, 'Indeed, the prayer has been established. The prayer has been established.'"  

أَنَّهُ يَقُولُ قَدْ قَامَتِ الصَّلَاةُ قَدْ قَامَتِ الصَّلَاةُ  

"أمَرَ رَسُولُ اللهِ ﷺ بِلاَلًا أَنْ يَشْفعَ الأذَانَ وَيُوتِرَ الإِقَامَةَ إِلَى قَوْلِه: قَدْ قَامَتْ الصَّلاَةُ فَإِنَّهَا مَرَّتيْنِ".