The Mu'adh-dhin of Messenger of Allah would wait and he would not call the Iqamah until he saw the Messenger of Allah had come out, he would call the Iqamah when he saw him."  

سَمِعَ جَابِرَ بْنَ سَمُرَةَ يَقُولُ كَانَ مُؤَذِّنُ رَسُولِ اللَّهِ ﷺ يُمْهِلُ فَلاَ يُقِيمُ حَتَّى إِذَا رَأَى رَسُولَ اللَّهِ ﷺ قَدْ خَرَجَ أَقَامَ الصَّلاَةَ حِينَ يَرَاهُ