Śatapatha Brāhmaṇa ("of a hundred paths") 4.2.5.10

4.2.5.10

naurha vā eṣā svargyā | yadbahiṣpavamānaṃ tasyā ṛtvija eva sphyāścāritrāśca svargasya lokasya sampāraṇāstasyā eka eva majjayitā ya eva nindyaḥ sa yathā pūrṇāmabhyāruhya majjayedevaṃ haināṃ sa majjayati tadvai sarva eva yajño nauḥ svargyā tasmādu sarvasmādeva yajñānnindyam paribibādhiṣeta

The Bahishpavamâna chant truly is a ship bound heavenwards: the priests are its spars and oars, the means of reaching the heavenly world. If there be a blameworthy one, even that one (priest) would make it sink: he makes it sink, even as one who ascends a ship that is full would make it sink. And, indeed, every sacrifice is a ship bound heavenwards: hence one should seek to keep a blameworthy (priest) away from every sacrifice.