The claim
The sources document the rulings of zakat in detail from the first generation.
The evidence
-
The chain of transmitters — passage/muwatta-1-020
A Muwatta hadith in the zakat section with its isnad.
-
chronicle — practice/zakat
The zakat record — the third pillar of Islam in the museum.
-
object — concept/five-pillars
The concept of the five pillars — the frame of worship in fiqh.
The historians' note
The fiqh works detail zakat's rulings; disagreement in branches does not negate consensus on the core.