The Holy Qur’an says,
“…and eat and drink and be not extravagant; surely He does not love the extravagant.” (Surah al-Ar’āf 7:31)
The above ayat suffices to show the dislike of Almighty Allah (S.w.T.) for the extravagant people. According to some exegesists of the Qur’an one who is not loved by Allah (S.w.T.) is doomed to perdition because the love of Allah (S.w.T.) implies Divine rewards.
According to Tafsīr Majmaul Bayan, Bakhti Shoa was the personal physician of Harūn al-Rashid. He was a Christian. One day he asked Waqidi, “Does your Holy book contain any medical knowledge?” Waqidi replied, “The Almighty Allah (S.w.T.) has condensed the complete medical knowledge in a single verse,
“…And eat and drink and be not extravagant.”
“Did your Prophet mention anything about this branch of knowledge?” asked the physician.
“Yes,” said Waqidi, “he has described the medical sciences in a brief sentence.
‘The stomach is the house of pain and abstinence is the most important medicine. Everyone should be given the amount (of food) he needs.’”
Upon hearing this, the Christian remarked, “Your Book and your Prophet have not omitted anything from medical science and Galen (the Greek physician) had nothing more to say.”