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yā-banī ʾādama khudhū zīnatakum ʿinda kulli masjidin wa-kulū wa-shrabū wa-lā tusrifū ʾinnahū lā yuḥibbu l-musrifīna
O Children of Adam! Put on your adornment on every occasion of prayer, and eat and drink, but do not waste; indeed, He does not like the wasteful.
— Ali Quli Qarai
Surah Al-‘A’raf, Verse 31
31. " O' children of Adam! wear your beautiful apparel at every time and place of prayer, and eat and drink but do not act extravagantly; verily He does not like the extravagant (ones)."
The verse addresses all the children of Adam, saying to them that they should take with themselves their clothing with which they ornament themselves when they perform every prayer. It has been narrated that whenever Imam Hasan Mujtaba (as) stood to keep prayer, he used to wear his best clothes. In answer to the question why he (as) used to do so, he said:
" Allah if beautiful and He likes beauty. Therefore, I decorate myself for Him."
And after that, he recited the verse under discussion.
Some of the commentators have said that this verse enjoins Muslims to wear their own clothes at the time of performing every prayer and circumambulation. This is opposite the notion of the pagans who used to circumambulate nakedly. They said that they would not worship the Lord with the clothes in which they had committed sins. Some other commentators have said that the purpose of 'wearing the beautiful apparel' is targeted to combing the hair at the time of establishing every prayer.
The verse continues saying:
It is narrated from Ibn-' Abbas who has said: "Eat whatever you desire, and wear whatever you like, but beware that the two qualities of extravagance and pride do not cause you to commit sin."