Ja'far bin Burqan said: I heard al-Zuhri (may Allah have mercy on him) saying: "Had Zayd bin Thabit (may Allah be pleased with him) not written down the knowledge of the fara'id (inheritance), I think it would have departed from the people."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12190