It is narrated from Qatadah (may Allah have mercy on him) that Ibn Mas'ud (may Allah be pleased with him) used to give all of his inheritance to his mother, and if he had no mother, he would give it to her 'asabah. Al-Hasan (may Allah have mercy on him) also says the same. And Ali and Zayd (may Allah be pleased with them both) used to say: For the mother is a third, and the rest goes to the public treasury of the Muslims.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12495