Imam Abu Hanifah, Allah be pleased with him, said:
“If it were not for two years of my life, I would have perished. For two years I accompanied Imam Jafar al-Sadiq and I acquired the spiritual knowledge that allowed me to become a knower of Allah by means of the path of spiritual purification.”
(Related in Al-Durr Al-Mukhthar)
Allah be well pleased with them all.