Yahya related to me from Malik from Ibn Shihab from Salim ibn Abdullah from his father that Umar ibn al-Khattab, when he went to Makka, used to lead them in prayer and do two rakas and then say, "People of Makka,complete the prayer, we are a group travelling."  

أَنَّ عُمَرَ بْنَ الْخَطَّابِ كَانَ إِذَا قَدِمَ مَكَّةَ صَلَّى بِهِمْ رَكْعَتَيْنِ ثُمَّ يَقُولُ يَا أَهْلَ مَكَّةَ أَتِمُّوا صَلاَتَكُمْ فَإِنَّا قَوْمٌ سَفْرٌ  

Yahya related to me from Malik from Ibn Shihab from Said ibn al- Musayyab that Umar ibn al-Khattab prayed two rakas with everybody when he arrived in Makka. Then, when he had finished, he said, "People of Makka, complete your prayer, because we are a group of travellers." Later, Umar ibn al-Khattab prayed two rakas with them at Mina, but we have not heard that he said anything to them on that occasion.  

أَنَّ عُمَرَ بْنَ الْخَطَّابِ لَمَّا قَدِمَ مَكَّةَ صَلَّى بِهِمْ رَكْعَتَيْنِ ثُمَّ انْصَرَفَ فَقَالَ يَا أَهْلَ مَكَّةَ أَتِمُّوا صَلاَتَكُمْ فَإِنَّا قَوْمٌ سَفْرٌ ثُمَّ صَلَّى عُمَرُ بْنُ الْخَطَّابِ رَكْعَتَيْنِ بِمِنًى وَلَمْ يَبْلُغْنَا أَنَّهُ قَالَ لَهُمْ شَيْئًا