Musannaf Ibn Abi Shaybah 38534 — the first to do a thing, and who did

Sayyiduna Jabir (may Allah be pleased with him) said that when Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) was made Caliph, he fixed the allotted shares, established the registers (diwans), and appointed the urafa (supervisors over groups of people).