Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.128.
It is preferred for anyone – man or woman, an elderly or young person, a traveller or a resident – who desires to attend the salatul Jumu’ah or any gathering of the people, to cleanse and to wear best attire. One should perform ghusl, put on one’s finest clothing, apply perfume, and to brush one’s teeth. The following hadith are recorded on this matter:
Abu Sa’id reports that the Prophet said: “Every Muslim should have a ghusl on Friday and wear his best clothing, and if he has perfume, he should use it.” This is related by Ahmad, al-Bukhari, and Muslim.
Ibn Salam reports that he heard the Prophet 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.” This is related by Abu Dawud and Ibn Majah.
Salman al-Farsi reports that the Prophet sallallahu alehi wasallam 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.” This is related by Ahmad and al-Bukhari, while Abu Hurairah used to say: “And for three more days as for every good deed Allah grants tenfold reward.” The sins mentioned in this hadith are the minor sins as Ibn Majah recorded, on the authority of Abu Hurairah in the words: “For one who has not committed major sins.”
Ahmad records, with a sahih chain, that the Prophet said: “It is obligatory upon every Muslim to perform ghusl, apply purfume and use the miswak on Jumu’ah.
Abu Hurairah reports that one Friday the Prophet said: “O gathering of Muslims, Allah has made this day an ‘id for you, so make ghusl and use the miswak.” This is related by at-Tabarani in al-Ausat and al-Kabir with a chain whose narrators are trustworthy.