Abu Hurairah reported,

A guest came to the Messenger of Allah ﷺ while he was still a disbeliever, so the Messenger of Allah ﷺ ordered that a sheep be milked, and the disbeliever drank its milk. Then another was milked, and he drank it. Then another, and he drank that too, until he had drunk the milk of seven sheep.The next morning he embraced Islam, so the Messenger of Allah ﷺ ordered a sheep to be milked for him, and he drank its milk. Then another was ordered, but he could not finish it.The Messenger of Allah ﷺ said, "The believer eats with one stomach, and the disbeliever eats with seven stomachs."

Ahmad 8879

Sahih

حدثنا إسحاق أنبأنا مالك عن سهيل عن أبيه

عن أبي هريرة

أن رسول الله ﷺ ضافه ضيف وهو كافر فأمر رسول الله ﷺ بشاة فحلبت فشرب الكافر حلابها ثم أخرى فشربه ثم أخرى فشربه حتى شرب حلاب سبع شياه ثم إنه أصبح فأسلم فأمر له رسول الله ﷺ بشاة فشرب حلابها ثم أمر بأخرى فلم يستتمها فقال رسول الله ﷺ المؤمن يأكل في معى واحد والكافر يأكل في سبعة أمعاء

أحمد 8879صحيح
Contents
Reference
Commentary
Ayat
Collection
Musnad Ahmad
Book
Abu Hurairah
Numbering
Darussalam 8879
Ahmad 8879