The later edition of QXP makes 2:3 more clear.
2:3 Those who (wish to journey through life in honor and security), believe in the Unseen, and establish the System of Salaat in which the following of Divine Commands is facilitated, and keep open for others the resources that We have granted them.
[Establishing Salaat = Establishing the System in which Permanent Moral Values rule the hearts and minds of men and women. There are neither masters nor subjects in such a system, since therein prevails the Rule of Law. (2:177, 22:41, 94:7-8). Al-Ghayeb = The Unseen: The likeness of a seed that is beneath the soil hidden from a farmer’s view. Yet the farmer believes that given proper environment and care the seed will sprout. (9:119, 57:20, 89:27-30). Salaat = To follow closely, like a runner-up (Musalli) follows the winning horse (Saabiq) = Follow God’s commands closely. Aqimussallat = Establish the System that facilitates the following of Divine Commands. Zakaat = The Just Economic Order where everyone works according to his capacity and is compensated according to his needs. People spend on others or give to the Central Authority (Islamic government) whatever is surplus (2:219). And they do so whenever they earn any income (6:141). The Islamic government as the trustee of all natural resources is responsible for maintaining a viable and benevolent state. The state gives Zakaat instead of taking (22:41). The System of Zakaat is managed by the government that ensures the development of the individuals and the society. The 2.5 percent ‘taking of’ annual charity is a non-Qur’anic concept that trivializes the comprehensive Qur’anic System of Zakaat. The Central Authority can levy taxes of varying percentages according to the changing times and needs of the society. Charity or Sadaqaat are meant for the interim period whenever the Divinely Prescribed System of Life is not yet in place. For Central Authority, the Qur’an uses the terms Allah and Rasool (3:32). After the exalted Rasool (Messenger), the believers must elect their leadership through a consultative process in a manner suitable for the times. The Qur’an gives us the basic Rules and leaves the details and the ways to implement them up to people. People will make decisions with mutual consultation according to changing times. (42:38). For God’s Right = Divinely ordained right of the poor, see 6:141, 11:64, 55:10]