Ali bin Abdullah (Ibn al-Madini, may Allah have mercy on him) said: I do not know of any hadith on the breaking of the fast of "the cupper and the cupped" more authentic than this one, meaning the hadith of Rafi' bin Khadij (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8292