ṚV, 2, 23, 4.2 brahmadviṣas tapano manyumīr asi bṛhaspate mahi tat te mahitvanam //

ṚV, 10, 34, 7.1 akṣāsa id aṅkuśino nitodino nikṛtvānas tapanās tāpayiṣṇavaḥ /