Sahih (Sahih Muslim)
وَحَدَّثَنِيهِ زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا شُعْبَةُ، بِهَذَا الإِسْنَادِ وَقَالَ صَلاَّهُمَا بِإِقَامَةٍ وَاحِدَةٍ .
Shu'ba reported this hadith with the same chain of transmitters and said:He (the Holy Prophet) observed the two prayers (together) with one iqama