Tirmidhi 797

Its chain is daif. Ahmad narrated it in his Musnad (4/335) through the hadith of Sufyan Thawri with the same chain. Diya included it in Mukhtarah, and Ibn Khuzayma graded it sahih (hadith 2145). Bayhaqi said in his Sunan (4/297), "This is mursal, and it has daif corroborating narrations." Bayhaqi also narrated with a sahih chain from Abu Hurairah, who said, "Cool booty is fasting in winter."