4-102 (The compiler of the book narrated) that his father and Muhammad ibn al-Hassan - may God be pleased with them - narrated that Muhammad ibn Yahya al-Attar and Ahmad ibn Idris quoted Muhammad ibn Ahmad ibn Yahya, on the authority of Muhammad ibn Isa who linked it up through a chain of narrators to Abi Ja’far al-Baqir (MGB),

“You should not tax four things: slaughtering; burial; buying slaves; and traveling to Mecca.”