Sunan an-Nasa'i, Book 22, Hadith 221 (In-Book) ⓘ

It was narrated that Abu Saeed said: "We were traveling with the Prophet and among us were some who were fasting and some who were not criticize those who were not, and those who were not fasting did not criticize those who were."

أَخْبَرَنَا سَعِيدُ بْنُ يَعْقُوبَ الطَّالْقَانِيُّ، قَالَ حَدَّثَنَا خَالِدٌ، - وَهُوَ ابْنُ عَبْدِ اللَّهِ الْوَاسِطِيُّ - عَنْ أَبِي مَسْلَمَةَ، عَنْ أَبِي نَضْرَةَ، عَنْ أَبِي سَعِيدٍ، قَالَ كُنَّا نُسَافِرُ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فَمِنَّا الصَّائِمُ وَمِنَّا الْمُفْطِرُ وَلاَ يَعِيبُ الصَّائِمُ عَلَى الْمُفْطِرِ وَلاَ يَعِيبُ الْمُفْطِرُ عَلَى الصَّائِمِ ‏.‏