Another answer: "Delivering a single letter of the Science of Monotheism [Tawhid] to one who accepts it is counted as a thousand hadiths given to one who does not accept it or lacks guidance [Rushd]."
He—may Allah sanctify him—also bestowed upon us another issue in clarifying the meaning of Zakat: Is it for the elite [Khass] and the general public ['Amm], or does it have specific people? The Answer: From what was narrated in the treatise Al-Bayan [The Clarification]: "Charity, righteousness, Zakat, and the bestowing of wealth by which the servant draws near to his Master—this is permissible and mandatory [only] for the people of knowledge and jurisprudence, the practitioners of the Inward Sciences, the People of Faith, and the 'Stations of Concealment' [Mawatin al-Kitman]; for this is what Allah has commanded."
And His saying: {Work, and may Allah facilitate your works} 1 . For knowledge and action are two harmonious brothers; neither stands except through the other.
He also said in the treatise Al-Bayan: "A believer is not permitted to bestow anything of charity, righteousness, or wealth except upon a brother among his brothers, and not upon anyone else.