Sahnun said: “Ibn al-Qasim said to me:
“If you desire this knowledge after me, then seek it with Ashhab.”
{Al-Madkhal al-Wajiz fi Istilat Madhhab as-Sadat al-Malikiyyah by Ibrahim al-Mukhtar Ahmad ‘Umar al-Jabruti az-Zayla’i via Aisha Bewley}
Sahnun wrote the Mudawanna and studied it with ibn al-Qasim. 30,000 + rulings.