Jaiminīya Upaniṣad Brāhmaṇa 3.17.3

3.17.3

etā vai vyāhṛtayas sarvaprāyaścittayaḥ
tad yathā lavaṇena suvarṇaṃ saṃdadhyāt suvarṇena rajataṃ rajatena trapu trapuṇā lohāyasaṃ lohāyasena kārṣṇāyasaṃ kārṣṇāyasena dāru dāru ca carma ca śleṣmaṇaivam evaivaṃ vidvāṁs tat sarvam bhiṣajyati /

These mystic utterances are indeed the universal atonements.
Just as one would join gold with salt-flux, silver with gold, tin with silver, lead with tin, iron with lead, wood with iron, and wood and leather with glue, even so one who knows thus heals all that.