Hadith.212 – From Zurarah, he asked Imam Muhammad ibn Ali Al-Baqir عليه السلام: 'Would you not inform me from where you derived and said that wiping is done on part of the head and part of the feet?' Imam عليه السلام smiled and said: 'O’ Zurarah, it was stated by the Messenger of Allah صلى الله عليه وعلى آله وسلم and it was revealed in the Book of Allah سبحانه وتعالى. Allah سبحانه وتعالى, the Exalted, said: "So wash your faces" (Qur'an 5:6). Thus, we understood that the entire face must be washed. Then Imam عليه السلام said: "and your hands up to the elbows." He connected the hands up to the elbows with the face, so we understood that they must be washed up to the elbows. Then, He separated between the statements and said: "and wipe your heads." Thus, we understood from "your heads" that wiping is done on part of the head due to the use of "bi" (preposition indicating partiality). Then, He connected the feet to the head just as He connected the hands to the face and said: "and your feet up to the ankles." So, we understood, by connecting them to the head, that wiping is done on part of them.' He continued: 'The Messenger of Allah صلى الله عليه وعلى آله وسلم explained this to the people, but they neglected it. Then Allah سبحانه وتعالى said: "If you do not find water, then seek clean earth and wipe over your faces and hands with it." Thus, when He waived the requirement of wudu for one who does not find water, He replaced some of the washing with wiping, as He said, "with your faces." Then He connected it with: "and your hands from it," meaning from that tayammum, because He knew that not all of the dust would reach the face, as some of it would adhere to part of the hand and not all of it. Then Allah سبحانه وتعالى said: "Allah سبحانه وتعالى does not intend to make difficulty for you," and difficulty means constraint.'"