Matsya Purana — The Array of the Gods: Description of the Vaiṣṇava Host and the Lokapālas
ज्योतिषामीश्वरं व्योम्नि रसानां रसदं प्रभुम् ओषधीनां सहस्राणां निधानममृतस्य च //
jyotiṣāmīśvaraṃ vyomni rasānāṃ rasadaṃ prabhum oṣadhīnāṃ sahasrāṇāṃ nidhānamamṛtasya ca //
In the sky, (I worship) the Lord of the luminaries; the sovereign who grants the very essence of all essences; the master—treasury of thousands of healing herbs, and the repository of immortality (amṛta) as well.
It frames the Supreme Lord as the governing source behind cosmic functions—light in the heavens, life-essence (rasa), healing herbs, and amṛta—implying that even in pralaya and re-creation, these sustaining principles ultimately rest in Him.
By portraying the Lord as the giver of rasa (vital essence) and the treasury of medicines, the verse underwrites dharmic governance and household life: a king should protect health and welfare, and a householder should sustain life through righteous provision, healing, and reverence for the divine source of prosperity.
Ritually, it supports worship that invokes the deity as cosmic regulator (luminaries) and life-sustainer (oṣadhi, amṛta), themes often reflected in temple rites and consecrations; architecturally, it indirectly aligns with Vastu’s concern for celestial order (sky/luminaries) as a basis for auspicious orientation and sacred planning.