Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) narrated: We were with the Prophet (peace and blessings be upon him). Some of us were fasting and some were not fasting. The fasting person did not find fault with the one not fasting, nor did the one not fasting find fault with the fasting person.
Imam al-Bazzar and Imam al-Tabarani in al-Mu'jam al-Awsat recorded this narration. Its chain contains a narrator, al-Walid bin Marwan, and he is majhul (unknown).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 4913