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Abu Hanifa al-Nu'man ibn Thabit; Anas ibn Malik; Muhammad ibn Idris al-Shafi'i and Ahmad ibn Hanbal. The first two Sunni Imams studied under Imam Ja'far al-Sadiq, the sixth Imam of the Shi'a.
In general, they rely upon the narrations of companions that are rejected by the Imams of the Shi'a owing to the fact that these companions actively opposed the fourth caliph, Ali ibn Abi Talib. The Imams of the Twelver Shi'a narrated directly back to the Prophet (s) via Ali ibn Abi Talib.