Nahj al-Balagha Hadith n. 478

Selections from The Sayings and Preaching of Amir al-Muminin Ali ibn Abi Talib (Peace Be Upon Him) Including His Replies to Questions and Maxims Expressed for Various Purposes.
Translated by Sayyid Ali Reza

وَقَالَ (عليه ‏السلام):

Amir al-mu'minin, peace be upon him, said:

مَا أَخَذَ اللهُ عَلَى أَهْلِ الْجَهْلِ أَنْ يَتَعَلَّمُوا

Allah has not made it obligatory on the ignorant to learn

حَتَّى أَخَذَ عَلَى أَهْلِ الْعِلْمِ أَنْ يُعَلِّمُوا.

till He has made it obligatory on the learned to teach.