Having first performed the Karna on the sacred fire with the help of Mantras, O you having penances for wealth, one should always pour libations next to the god of fire, and Soma, and Varuna.
कृत्वाग्नौ करणं पूर्व मन्त्रपूर्वं तपोधन। ततोऽग्नयेऽथ सोमाय वरुणाय च नित्यशः॥