Musnad Ahmad 31:220

Yahya narrated to us, from Muhammad ibn Abi Yahya, he said: My father narrated to me, that Abu Sa’id al-Khudri narrated to him, that the Prophet, peace and blessings of Allah be upon him, when it was the day of al-Hudaybiyyah, said: "Do not kindle a fire at night." He said: Then when it was after that, he said: "Kindle [fires], and prepare food, for no people after you will attain your *sa’* (a measure) nor your *mudd* (a measure)."