Śatapatha Brāhmaṇa ("of a hundred paths") 3.7.4.2

3.7.4.2

dharṣā mānuṣa iti | na vā etamagre manuṣyo 'dhṛṣṇotsa yadevartasya pāśenaitaddevahaviḥ pratimuñcatyathainam manuṣyo dhṛṣṇoti tasmādāha dharṣā mānuṣa iti

'Be bold, O man!' for at first man dared not to approach it (the victim); but now that he thus binds it with the noose of sacred order, as an oblation to the gods, man dares to approach it: therefore he says, 'Be bold, O man!'