Atharvavedaparishishta 8.1.2

8.1.2

prātaḥprātaḥ śaṅkhadundubhinādena brahmaghoṣeṇa vā prabodhito rājā śayanagṛhād utthāyāparājitāṃ diśam abhiniṣkramyopādhyāyaṃ pratīkṣeta ||

Every morning, awakened by the sound of conches and kettledrums or by the recitation of the Veda, the king, having risen from his bedchamber and gone out towards the invincible direction [the northeast], should await his preceptor.