Begin with the Memorization of the Mighty Qur’aan

 (The Book of Manners)

Imaam an-Nawawee said:

“So the first thing which he should begin with is the memorization of the mighty Qur'aan, which is the most important of the branches of knowledge. And the Salaf did not used to teach hadeeth or fiqh, except to one who had memorized the Qur'aan. So when he has memorized it, then let him beware of pre-occupying himself from it with hadeeth, or fiqh, or other things, to the extent that it leads him to forget anything from the Qur'aan, or makes that likely.”

[Al Majmoo' Sharhul Muhadhab (1/38).]