GB, 1, 2, 16, 18.0 yo ha vā etam amantravantaṃ brahmaudanam upeyād apaśirasā ha vā asya yajñam upeto bhavati //

GB, 2, 2, 6, 34.0 apaśirasā ha vā eṣa yajñena yajate yo 'pravargyeṇa yajate //