The Law Code of Yājñavalkya 2.8.6

2.8.6

tatra śāstraikasamadhigamyam iti tāvad yuktam gautamavacanāt: svāmī rikthakrayasaṃvibhāgaparigrahādhigameṣu, brāhmaṇasyādhikaṃ labdhaṃ, kṣatriyasya vijitaṃ, nirviṣṭaṃ vaiśyaśūdrayoḥ (GDh 10.39–42)| iti | pramāṇāntaragamye svatve nedaṃ vacanam arthavat syāt | tathā stenātideśe manuḥ:

On this point, it is prima facie reasonable that it is knowable solely through sacred tradition, from Gautama's statement: 'One becomes an owner through inheritance, purchase, partition, seizure, or finding; for a Brahmin, that which is received is an additional [means]; for a Kshatriya, what is conquered; for a Vaishya and a Shudra, what is earned.' (GDh 10.39–42) If ownership were knowable through other means of knowledge, this statement would be meaningless. Likewise, Manu says in the context of extension [of the rules] regarding a thief: