"I heard Muas- bin Salamah-say: 'I said to Ibn 'Abbas: How should I pray in Makkah if I do not pray in congregation? He said: Two rak'ahs, the sunnah of Abu Al-Qasim.'"  

قُلْتُ لاِبْنِ عَبَّاسٍ كَيْفَ أُصَلِّي بِمَكَّةَ إِذَا لَمْ أُصَلِّ فِي جَمَاعَةٍ قَالَ رَكْعَتَيْنِ سُنَّةَ أَبِي الْقَاسِمِ ﷺ  

"I missed the prayer in congregation when I was in Al-Batha; how do you think I should pray?" He said: "Two rak'ahs, the sunnah of the Messenger of Allah ﷺ."  

رَكْعَتَيْنِ سُنَّةَ أَبِي الْقَاسِمِ ﷺ