31 — Abū Khaythama narrated to us: ‘Abd al-Rahmān ibn Mahdī narrated to us, from Sufyān, from Abū al-Agharr, from Wahb ibn Munabbih, who said regarding the wisdom teachings of the House of David: “A person of sound reason must understand the age in which he lives, guard his tongue, and attend to his own affairs.”