The Prophet (blessings and peace of Allah be upon him) used to accept the oath of allegiance (bay‘ah) from his companions when they became Muslim, to affirm their commitment to their faith, and to teach them the most important duties of Islam when they first became Muslim. In this hadith, Jarir ibn ‘Abdillah (may Allah be pleased with him) said: I swore allegiance to the Messenger of Allah (blessings and peace of Allah be upon him), pledging to do these things: to establish prayer, which is done by regularly offering the five daily prayers in the manner required, on time, with all their essential parts, obligatory actions and conditions. And [pledging to] give zakah, which is an obligatory, financial act of worship, to be given on every type of wealth that meets the minimum threshold, as defined in Islamic teachings, when one full lunar (or Hijri) year has passed since acquiring that wealth, giving one quarter of one tenth. One should also give zakah on an‘am animals [camels, cattle and sheep] and other livestock; zakah on crops, fruits, and trade goods; and zakah on rikaz, which is buried treasure that is brought out of the earth and, it was said, minerals and metals, on the basis of their nisab (minimum threshold), to be given at the time at which their zakah becomes due. Giving zakah in the proper manner to those who are entitled to it brings increased blessing (barakah) to wealth, and brings great reward in the hereafter, whereas being stingy and withholding it from those who are entitled to it brings bad consequences in this world and the hereafter. Zakah combines the rights of Allah and the rights of people, and it is an obligatory duty and one of the pillars of Islam. It is a means of meeting the needs of those who are in need. He said: I also pledged to be sincere to every Muslim man and woman, by being keen to benefit them, helping them to attain all that is good and warding off from them all that is bad, in both word and deed. Muslims are mentioned in particular because this is what is usually the case [in a majority-Muslim society]. However, sincerity towards disbelievers also matters, which means calling them to Islam and offering sound and sincere advice if they ask for it. And it was said that only prayer and zakah are mentioned here because all other financial and physical acts of worship stem from them, as they are the major financial and physical acts of worship. They are the most important pillars of Islam after uttering the words of the twin declaration of faith. Moreover, fasting comes under the heading of physical acts of worship, and the one who regularly and consistently offers the prayers is more likely to fast, whereas if someone fasts, he does not necessarily adhere to praying regularly. Hajj is a combination of both financial and physical acts of worship, so whoever prays and fasts is going to do Hajj, especially when it is required only once in a lifetime, unlike the prayer, for which there are set times every day and night, and zakah, which is to be given once every year, from wealth that reaches the minimum threshold (nisab). The reason why the Prophet (blessings and peace of Allah be upon him) mentioned the issue of sincerity to Jarir (may Allah be pleased with him) in particular is that he was the chief and leader of his people. He came to the Prophet (blessings and peace of Allah be upon him) in 10 AH and became Muslim, and his people followed him. So the Prophet (blessings and peace of Allah be upon him) advised him to be sincere because he had a greater need to do that. This hadith indicates that it is obligatory to show sincerity towards the Muslims, to wish them well, to be keen to help them and to strive to benefit them..