Sahih Muslim 710
Sahih Muslim · Book 6: The Book of Prayer - Travellers · It is disliked to start a voluntary prayer after the Mu’adhdhin has started to say Iqamah for prayer, whether that is a regular sunnah, such as the sunnah of Subh or Zuhr, or anything else, and regardless of whether he knows that he will catch up with the rak`ah with the Imam or not
This hadith has been narrated by Abu Huraira with another chain of transmitters. Hammad (one of the narrators) said:
وَحَدَّثَنَا حَسَنٌ الْحُلْوَانِيُّ ، حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ ، أَخْبَرَنَا حَمَّادُ بْنُ زَيْدٍ ، عَنْ أَيُّوبَ ، عَنْ عَمْرِو بْنِ دِينَارٍ ، عَنْ عَطَاءِ بْنِ يَسَارٍ ، عَنْ أَبِي هُرَيْرَةَ ، عَنِ النَّبِيِّ صلى الله عليه وسلم . بِمِثْلِهِ . قَالَ حَمَّادٌ ثُمَّ لَقِيتُ عَمْرًا فَحَدَّثَنِي بِهِ وَلَمْ يَرْفَعْهُ .
I then met 'Amr (the other narrator) and he narrated it to me, but it was not transmitted directly from the Messenger of Allah (ﷺ).