GB, 1, 1, 22, 3.0 sa tu khalu mantrāṇām atapasāśuśrūṣānadhyāyādhyayanena yad ūnaṃ ca viriṣṭaṃ ca yātayāmaṃ ca karoti tad atharvaṇāṃ tejasā pratyāpyāyayet //