Ya’qoob bin Ebrahim, also known as Abu Yusuf (rahimahullah), was the renowned student of Imaam Abu Hanifah (rahimahullah). He narrates the following:

I would study the knowledge of Hadith and Fiqh whereas I was in a state of poverty and straitened conditions. My father thus came to me one day while I was seated with Imaam Abu Hanifah (rahimahullah). When I left the gathering of Imaam Abu Hanifah (rahimahullah) with my father, he said to me, “O my son! Do not stretch your legs with Imaam Abu Hanifah (rahimahullah), for his bread is roasted whereas you need to earn a livelihood (i.e. do not spend your time acquiring the knowledge of Deen from Imaam Abu Hanifah (rahimahullah) for he has sufficient wealth that allows him to free himself for Deen whereas you do not have wealth).”