https://en.wikipedia.org/wiki/Hanbali
WebImam Ahmad ibn Hanbal, the founder of Hanbali school of thought (), was a disciple of the Sunni Imam Al-Shafi‘i, who was reportedly a student of Imam Malik ibn Anas,: 121 who was a student of the Imam Ja'far al-Sadiq, like Imam Abu Hanifa. Thus all of the four great Imams of Sunni Fiqh are connected to Imam Ja'far al-Sadiq from the Bayt of Muhammad, …