Urwah (may Allah have mercy on him) narrates from his father that Sayyiduna al-Zubayr bin al-Awwam (may Allah be pleased with him) said: The wala' is taken by the very one who takes the inheritance.
«Yahuzu al-mirath» (takes the inheritance) refers to the 'asabah, who take all the remaining wealth after the holders of fixed shares (ashab al-furud).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الولاء / 21505