Allah rendered all the types of goodness a person does to himself as an act of worship and to others of kindness - as part of the charities of the body and its good health and well-being. In this Hadīth, the Prophet (may Allah's peace and blessings be upon him) says: "Every morning charity is due for every joint bone" i.e., for all the organs and joints of the body. Sulāma, in Arabic, originally refers to the bones of fingers, hands, and legs, and then it was later used to refer to all the body parts. So, every morning, a person is required to give charity for every organ of his body, in gratitude to Allah Almighty for His great favors. Indeed, the structure of bones and their joints is one of the great favors Allah has bestowed upon His servants. Hence, each bone requires a charity to be given by the person for it, as gratitude for this blessing. Charity here is intended as something recommended and encouraged, not obligatory or binding, for it is sufficient as gratitude for these favors to perform the obligations and shun the prohibitions. Then, the Messenger of Allah (may Allah's peace and blessings be upon him) guides to some acts of piety which a person may perform as charity for his joints. "Every Tasbīh" (glorification of Allah) - saying: Subhān Allah (glory be to Allah) - "is an act of charity"; "every Tahmīd" (praise of Allah) - saying: Al-Hamdulillāh (praise be to Allah) - "is an act of charity"; "every Tahlīl" (proclamation of Allah's oneness) - saying: Lā Ilāha illa Allah (there is no god but Allah) - "is an act of charity"; "and every Takbīr" - saying: Allāhu Akbar (Allah is the Greatest) - "is an act of charity"; "and enjoining Ma‘rūf (what is good) is an act of charity and forbidding Munkar (what is evil) is an act of charity." Likewise, all other forms of Dhikr and worship are charities for oneself. Ma‘rūf: It is a term that comprises all what is known to be a form of obedience to Allah Almighty and benevolence to people. Munkar: It refers to all offensive deeds and words that lead to disobedience to Allah Almighty; and it is a term that comprises all forms of evil. So, if anyone performs the mentioned acts of goodness and the like, it should be equal in number to the 360 joints. Then, the Prophet (may Allah's peace and blessings be upon him) informs that "two Rak‘ahs which one offers in the forenoon" are sufficient in place of all that, for prayer is an act that is done by all the body parts and it includes all the mentioned charities and others. This demonstrates the great merit of the Duha prayer. The time of the Duha prayer starts 15 minutes after sunrise and extends to also 15 minutes before soon. The minimum in the Duha prayer is two Rak‘ahs, and the maximum is eight Rak‘ahs, as related in a Hadīth in the Two Sahīh Collections, in which ’Umm Hāni’ (may Allah be pleased with her) reported: "that the Prophet (may Allah's peace and blessings be upon him) took a bath in her house on the day of the Conquest of Makkah and prayed eight Rak‘ahs." It is said: There is no limit to its maximum, as indicated by a Hadīth by Muslim, in which ‘Ā’ishah (may Allah be pleased with her) reported: "The Prophet (may Allah's peace and blessings be upon him) used to offer the Duha prayer as four Rak‘ahs and pray as much more as he wished.".