The Compendium of Bheḷa 1.9.17

1.9.17

yasya bhūtasya taddravyaṃ tattadātmakamiṣyate | sauṣiryaṃ lāghavaṃ yatra bhaiṣajyaṃ cāpi khātmakam ||

that substance is considered to be of the nature of that element. / Where there is porosity and lightness, that medicament is of the nature of space;