Sayyidina Abu Hurayrah (RA) narrated that Allah’s Messenger (SAW) had as a guest an infidel. He ordered that a sheep should be milked. He drank that, then he drank a second helping; and he drank a third helping; till he consumed seven rounds. Then, the morning of the next day, he embraced Islam and Allah’s Messenger (SAW) commanded that a sheep should be milked for him which he drank; then he gave instructions for more, but he could not drink it all. So, Allah’s Messenger (SAW) said, “The Believer drinks in one intestine while the disbeliever drinks in seven intestines.”
[Muslim 2063]