The Messenger (peace be upon him and his family): It is narrated from Hudhayfa: One day Ali (peace be upon him) turned toward the Qiblah and began to pray. When he went into ruku, a poor man came to him and Ali (peace be upon him) gave him his ring as charity. At that moment Allah revealed this verse: 'Your guardian and wali is only Allah, and His Messenger, and those who believe — those who establish prayer and give zakat while in ruku.' (al-Ma'idah/55) The Messenger of Allah (peace be upon him and his family) said takbir and recited the verse to us. Then he said: 'Rise up so that we may go to the one who possesses this quality about whom Allah [has revealed this verse].' When the Messenger of Allah (peace be upon him and his family) entered the mosque, a poor man came toward him. The Prophet (peace be upon him and his family) asked: 'Where are you coming from?' He said: 'From this one who was praying, who gave me this ring as charity while in ruku.' The Messenger of Allah (peace be upon him and his family) said takbir and moved toward Ali (peace be upon him) and said: 'O Ali (peace be upon him)! What new good deed have you done today?' Ali (peace be upon him) described his encounter with the poor man. The Messenger of Allah (peace be upon him and his family) said takbir for the third time. At this the hypocrites looked at one another and said: 'Our hearts will never be content with obedience to Ali (peace be upon him). So let us come and ask the Messenger of Allah (peace be upon him and his family) to change him.' So they came to the Messenger of Allah (peace be upon him and his family) and informed him of this matter. At that moment Allah revealed this verse: قُلْ ما یَکُونُ لِی أَنْ أُبَدِّلَهُ مِنْ تِلْقاءِ نَفْسِی إِنْ أَتَّبِعُ إِلَّا مَا یُوحَی إِلیََّ إِنیِّ أَخَافُ إِنْ عَصَیْتُ رَبیِّ عَذَابَ یَوْمٍ عَظِیم [Say: It does not beseem me that I should change it of myself; I follow naught but what is revealed to me; surely I fear, if I disobey my Lord, the punishment of a mighty day]. Jibra'il said: 'O Messenger of Allah (peace be upon him and his family)! Complete the task [and introduce Ali (peace be upon him) as your successor].' The Messenger of Allah (peace be upon him and his family) said: 'My friend, Jibra'il! You heard their conspiracies.' At this Jibra'il the Trustworthy (peace be upon him) departed from the Messenger of Allah (peace be upon him and his family).