Every Friday

Abu Sa'id (radi Allahu anhu) reports that the Prophet (sal Allahu alaihi wa sallam) said: "Every Muslim should have a ghusl on Friday and wear his best clothing, and if he has perfume, he should use it." [Sahih Bukhari]

Ibn Salam reports that he heard the Prophet (sal Allahu alaihi wa sallam) say, while he was upon the pulpit on Friday: "It would do no [harm] to anyone if he were to buy two gowns for Friday other than his work clothes." [Abu Dawud, Ibn Majah]

It is highly recommended for anyone - man or woman, an elderly or young person, a traveler or a resident - who desires to attend salatul Jumu'ah or any gathering of people, to cleanse and to wear their best attire. One should perform ghusl, put on one's finest clothing, apply perfume, and brush one's teeth.

Abu Hurairah reports that one Friday the Prophet (sal Allahu alaihi wa sallam) said: "O gathering of Muslims, Allah has made this day an 'id for you, so make ghusl and use the miswak." [Tabarani in al-Ausat]

Salman al-Farsi reports that the Prophet (sal Allahu alaihi wa sallam) said: "A man who performs ghusl on Friday, purifies [himself] what he can and uses dye [for his hair] or perfumes himself in his house, goes to the mosque, and does not cause separation between two people [who are already seated], prays what Allah has prescribed for him, and then listens quietly while the imam speaks, all his sins between that Friday and the next Friday will be forgiven." [Sahih Bukhari] The sins mentioned in this hadith are minor sins as Ibn Majah recorded, on the authority of Abu Hurairah: "For one who has not committed major sins."