Śatapatha Brāhmaṇa ("of a hundred paths") 3.3.3.6

3.3.3.6

atha hiraṇye vācayati | śukraṃ tvā śukreṇa krīṇāmīti śukraṃ hyetacukreṇa krīṇāti yatsomaṃ hiraṇyena candraṃ candreṇeti candraṃ hyetaccandreṇa krīṇāti yatsomaṃ hiraṇyenāmṛtamamṛtenetyamṛtaṃ hyetadamṛtena krīṇāti yatsomaṃ hiraṇyena

He then makes (the sacrificer) say on the gold (Vâg. S. IV, 26), 'Thee, the pure, I buy with the pure,' for he indeed buys the pure with the pure, when (he buys) Soma with gold;--'the brilliant with the brilliant,' for he indeed buys the brilliant with the brilliant, when (he buys) Soma with gold;--'the immortal with the immortal,' for he indeed buys the immortal with the immortal, when (he buys) Soma with gold.