الإستقامة درجة بها كمال الأمور و تمامها وبوجودها حصول الخيرات و نظامها و من لم يكن مستقيما في حالته ضاع سعيهُ و خابَ جَهدهُ
The Islamic lesson of istiqamah is the way to perfect and complete every matter, and good results only come about through it, for whoever is not perseverant in his efforts, they shall surely be wasted.
—the Ḥanafī scholar Abu’l-Qāsim al-Qushayrī (d. 465H)
Once a scholar of ḥadīth visited the great Ḥanafī jurist Abū Yūsuf to exchange knowledge and benefit. On the first day, the muḥaddith relayed a number of ḥadīth. The next day, he approached Abū Yūsuf for a fiqh ruling on a contemporary issue, who promptly provided him with the ruling. When the muḥaddith asked Abū Yūsuf for his proof and what he based his ruling on, Abū Yūsuf replied, “From the ḥadīth you relayed to us yesterday,” and spelled out his proof derivations. The muḥaddith laughed and announced to all present: