Concerning the methods of teaching...
Concerning the methods of teaching, in order to move the common opinions, or to shake the lifeless body of a society, sometimes we must invent a new action, as Moses (as) behaved so harshly unto his own sinless successor, Aaron; or when Amir-ul-Mu’mineen Ali (as) was preaching for people, in order to attract their attention, he slapped hardly in his own face. However, at first Moses (as) turned his face to his brother Aaron, and said: “O Aaron!
What hindered you when you saw them going astray,” “So that you did not follow me? Did you then disobey my order?’” Did I not tell you: “Be my successor among people, and set the (people’s) affairs right and do not follow the way of mischief-makers” when I wanted to leave for the tryst?
The purpose of the Qur’anic phrase which is recited: /’alla tattabi‘ani/ is: ‘Why did you not follow my style and my ordinances in severity of action concerning idolatry?’ Moses (as), with an intensive anger and violence, said these words to his brother shouting at him, while he was taking his hair and his head and dragging Aaron.
In order to sooth and to decrease his inflammation, Aaron called him as the son of his mother (in stead of his brother) and wanted him not to seize him by his beard and his head, since he though if he raised to struggle against them there would appear a great dispersion among the Children of Israel.
Also, he feared that at the time of his return, Moses might say that he had caused division among the Children of Israel and in his absence he had not observed his order and had not acted his instructions. The verse says: “Said (Aaron): ‘O son of my mother! Seize me neither by my beard nor by (the hair of) my head! Verily I feared lest you would say ‘You have caused division among the Children of Israel, and you did not observe my word!’” And, in this way, Aaron (as) proved his innocence.
Explanations Leaders should be responsible for the aberrations of their people. The silence and inattentiveness of the authorities is often reproachful. A prophet can be an obedient to another prophet. The Faith and religiousness is more important than family adherence. Religious zeal is a requisite of prophethood.