It is narrated from Ibrahim (may Allah have mercy on him) that Umar and Abdullah (may Allah be pleased with them both) both used to make the blood relatives (dhawu al-arham) heirs to the exclusion of the mawlas. I said to him: Did Ali (may Allah be pleased with him) also do so? He said: Ali (may Allah be pleased with him) was the strictest of them in that.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12393