Kautilya's Arthashastra 2.2.2

2.2.2

pradiṣṭābhayasthāvarajaṅgamāni ca brahmasomāraṇyāni tapasvibhyo gorutaparāṇi prayacchet //

Bráhmans shall be provided with forests for sóma plantation, for religious learning, and for the performance of penance, such forests being rendered safe from the dangers from animate or inanimate objects, and being named after the tribal name (gótra) of the Bráhmans resident therein.