Muqatil bin Hayyan (may Allah have mercy on him) said concerning the saying of Allah Almighty, "And test the orphans" [Surah al-Nisa: 6]: In this the guardians and executors are being commanded: Test them when they reach the age of marriage; "then if you perceive in them sound judgement" [Surah al-Nisa: 6], that is, if they acquire an inclination towards religion and learn to safeguard their property, then "hand over to them their property" [Surah al-Nisa: 6].
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحجر / 11325