Tafsir of Al-A'raf 7:31

{Take your adornment} Meaning: your attire and your garments of adornment.

{At every mosque} Meaning: whenever you pray or perform tawāf (circumambulation). They used to perform tawāf naked.

It is narrated from Ṭāwūs that He did not command them to wear silk or brocade. Rather, one of them would perform tawāf naked, leaving his clothes behind the mosque. If he performed tawāf while wearing them, he would be beaten and they would be stripped from him, because they said: "We will not worship Allah in clothes in which we have sinned." It is also said: it was an omen, hoping to be stripped of sins just as they were stripped of clothes. It is also said: "adornment" refers to the comb, or to perfume. The Sunnah is for a man to take his best appearance for prayer.

The Banū ʿĀmir, during their pilgrimage days, would not eat food except for the bare minimum, and they would not eat fat, seeking to honor their pilgrimage through this. The Muslims said: "We are more entitled to do that." So it was said to them: {Eat and drink, but do not be extravagant.}

From Ibn ʿAbbās (may Allah be pleased with him): "Eat what you wish and wear what you wish, as long as you avoid two traits: extravagance and arrogance."

It is narrated that al-Rashīd had a skilled Christian physician who said to ʿAlī ibn al-Ḥusayn ibn Wāqid: "There is nothing of medical science in your Book, and knowledge is of two types: the knowledge of bodies and the knowledge of religions."

He replied: "Allah has gathered all of medicine in half an ayah of His Book." The physician asked: "And what is it?" He said: The saying of the Almighty: {And eat and drink, but do not be extravagant.}

The physician asked: "And is there nothing from your Messenger regarding medicine?" He said: "Our Messenger (peace be upon him) gathered medicine in a few words." He asked: "And what are they?" He said: His saying: "The stomach is the house of disease, and abstinence (dieting) is the head of the remedy, and give every body what you have accustomed it to."

The Christian said: "Your Book and your Prophet have left no medicine for Galen."