“Why, then, should not of every section of them, a party go forth, that they may become learned in (the knowledge of) religion, and that they may warn their people when they return to them, that they may be aware.” (9:122)
This verse confirms that all members of Muslims must not occupy themselves in works like Jihad and so on. Rather there should be a party of them who occupy themselves day and night to acquire perfect understanding of faith. They may thus teach the commands of Shari’ah to those who cannot find time to acquire knowledge.
This verse binds the section devoting itself to learning to acquaint other people to the laws of Shari’ah. And, it binds these other people to conduct themselves on the teachings imparted to them by the learned section and thus keep themselves away from disobedience to Allah. This is taqleed.
Imam Jassas has said:
“In this verse, Allah has made it obligatory for the masses that when the ulama acqaint them (with commands of Shari’ah) then they must preserve themselves (from disobedience to Allah) and obey the ulama.” (Ahkam-ul-Quran, v2 p262)