Sahih Muslim Book - 13, Hadith - 2621

وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِى شَيْبَةَ حَدَّثَنَا أَبُو خَالِدٍ الأَحْمَرُ عَنْ حُمَيْدٍ قَالَ خَرَجْتُ فَصُمْتُ فَقَالُوا لِى أَعِدْ. قَالَ فَقُلْتُ إِنَّ أَنَسًا أَخْبَرَنِى أَنَّ أَصْحَابَ رَسُولِ اللَّهِ -صلى الله عليه وسلم- كَانُوا يُسَافِرُونَ فَلاَ يَعِيبُ الصَّائِمُ عَلَى الْمُفْطِرِ وَلاَ الْمُفْطِرُ عَلَى الصَّائِمِ. فَلَقِيتُ ابْنَ أَبِى مُلَيْكَةَ فَأَخْبَرَنِى عَنْ عَائِشَةَ - رضى الله عنها - بِمِثْلِهِ.

It was narrated that Humaid said: “I went out and I was fasting. They said to me: ‘Repeat it.’ I said: ‘Anas told me that the companions of the Messenger of Allah used to travel, and those who fasted did not criticize those who did not, and those who did not fast did not criticize those who did.’” Then I met Ibn Abi Mulaikah and he narrated something similar to me from Aishah [may Allah be pleased with her].