Śatapatha Brāhmaṇa ("of a hundred paths") 4.6.9.13

4.6.9.13

te dakṣiṇasya havirdhānasya | adho 'dho 'kṣam sarpanti sa yathāhistvaco nirmucyetaivaṃ sarvasmātpāpmano nirmucyante 'ticandasā sarpantyeṣā vai sarvāṇi candāṃsi yadaticandāstathainānpāpmā nānvatyeti tasmādaticandasā sarpanti

They creep along right under the axle of the southern cart: even as a snake frees itself from its skin, so do they free themselves from all evil. They creep along with an atikhandas verse; for that, the atikhandas (redundant metre), is all the metres;--thus evil does not overtake them: therefore they creep along with an atikhandas verse.