حَدَّثَنَا رَوْحٌ حَدَّثَنَا سَعِيدٌ عَنْ عَبْدِ السَّلَامِ عَنْ حَمَّادٍ عَنْ إِبْرَاهِيمَ عَنْ عَلْقَمَةَ عَنْ عَبْدِ اللَّهِ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يَصُومُ فِي السَّفَرِ وَيُفْطِرُ وَيُصَلِّي الرَّكْعَتَيْنِ لَا يَدَعُهُمَا يَقُولُ لَا يَزِيدُ عَلَيْهِمَا يَعْنِي الْفَرِيضَةَ
مسند امام احمد بن حنبل · Hadith 3867
It was narrated from Ibn Mas'ood (RA) that the Messenger of Allah (PBUH) used to fast when he was travelling (sometimes) and he would not fast (sometimes), and he would pray two rnk’ahs only, i.e. he did not add to them - i.e., the obligatory prayers.
Sanad
حَدَّثَنَا رَوْحٌ حَدَّثَنَا سَعِيدٌ عَنْ عَبْدِ السَّلَامِ عَنْ حَمَّادٍ عَنْ إِبْرَاهِيمَ عَنْ عَلْقَمَةَ عَنْ عَبْدِ اللَّهِ