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Friday Prayer as an Obligation
The scholars are in agreement that salatul Jumu'ah is an individual obligation and it is two rak'at. Allah says in the Qur'an: "O you who believe, when the call for the salah of Jumu'ah is proclaimed, hasten unto the remembrance of Allah, and leave off business (and trading). That is best for you if you but knew."
The obligatory nature of salatul Jumu'ah is also obvious from the hadith recorded by al-Bukhari and Muslim from Abu Hurairah that the Prophet said: "We are the last [of the people to come] but the first on the day of resurrection. They received their books before us and we got ours after them. This day was obligatory upon them, but they differed concerning it, and Allah guided us. The people, therefore, follow us: the Jews tomorrow and the Christians the day after tomorrow."
Ibn Mas'ud reports that the Prophet noticed some people staying away from al-Jumu'ah and said: "I had the notion to order someone to lead the people in prayer, and then to go and burn the houses of those who stayed away from al-Jumu'ah." This is related by Ahmad and Muslim.
Abu Hurairah and Ibn 'Umar report that they heard the Prophet sallallahu alehi wasallam say: "Those who are not attending the Friday salah should change their ways; otherwise, Allah, the Exalted, will seal their hearts and they will be reckoned the heedless." This is related by Muslim, and by Ahmad and an-Nasa'i from ibn 'Umar and ibn 'Abbas.
Abu al-Ja'd ad-Damari reports that the Prophet said: "Whoever misses three Friday prayers in a row out of negligence will have a seal put over his heart by Allah."
This is related by the five, and Ahmad and Ibn Majah have something similar from Jabir, while Ibn as-Sakin has graded it to be sahih.
Upon whom Salatul Jumu'ah is obligatory
Salatul Jumu'ah is an obligation upon every free, adult, sane, resident Muslim who has the ability to attend the salah and does not have a valid excuse to miss it.
Salatul Jumu'ah, however, is not obligatory on the following: Women and children. Concerning this category there is no difference of opinion.
The person who is ill and faces hardship if he goes to the mosque, or who fears that his illness will be increased by going to the mosque, or whose recovery will be delayed. This also includes the person who is nursing a very ill person if, especiallay, the ill person cannot manage in the absence of the nursing person.
Tariq ibn Shihab reports that the Prophet sallallahu alehi wasallam said: "Al-Jumu'ah is a duty upon every Muslim in the community, save four: a slave, or a woman, or a child, or a person who is ill." An-Nawawi says that its chain is sahih according to the conditions set by al-Bukhari and Muslim. Ibn Hajr says that more than one person has graded it sahih.
All of these people are not obliged to pray the Friday salah although they are obliged to pray the zuhr. Should one of them pray salatul Jumu'ah, it will still be valid for him or her and he will no longer be obliged to pray the zuhr. And the women during the time of the Prophet sallallahu alehi wasallam, attended the mosque and used to pray al-Jumu'ah with him.
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari