Sahih Bukhari, Chapter: Wills and Testaments (Wasaya)

Nafi said, "Ibn Umar never refused to be appointed as a guardian." The most beloved thing to Ibn Sirin concerning an orphan's wealth was that the orphan's advisors and guardians would assemble to decide what is best for him. When Tawus was asked about the something concerning an orphan's affairs, he would recite: '...And Allah knows him who means mischief from him who means good...' (2.220) Ata said concerning some orphans, "The guardian is to provide for the young and the old orphans according to their needs from their shares."