Musnad Ahmad 31:203

Yahya narrated to us, from Shu'bah, Qatadah narrated to us, from Abu Nadrah, from Abu Sa'id al-Khudri, who said: "We went out with the Prophet, may Allah bless him and grant him peace, to Hunayn when seventeen — or eighteen — days of Ramadan had passed. Some fasted and others broke their fast, and neither group criticized the other, nor did the others criticize them."