Anandakanda 1.12.13

1.12.13

mṛttikā tāṃ samāhṛtya karṣamātraṃ pibetpriye /
kṣīrayuktāṃ ca saptāhaṃ sa sākṣādamaro bhavet //

Taking that earth, one should drink only a karṣa of it, my dear, / with milk for seven days; he becomes visibly immortal.