Does anyone know what is the meaning of following mantra?
प्राण विखंडन मन्त्र -
।। ॐ तच्चक्षुर्देवहितं पुरस्ताच्छुक्रमुच्चरत् हूं फट् ।।
prāṇa vikhaṃḍana mantra -
।। oṃ taccakṣurdevahitaṃ purastācchukramuccarat hūṃ phaṭ ।।
This is a cryptic mantra taken from the said upanishad by taking first letter of mantras like acronym. I want to find meanings of all that mantra and find all the slocks in full. If possible please share the upanishad if anybody have it.