Thesaurizate vobis thesauros [in celo ubi]

Only readable with great difficulty. No single word is legible in full, but search in Cantus Database of portions of words allowed for identification (also the 4^th mode and its final 'E' are discernible and agreeing with the Cantus records).
Oddly, the last note of the pneuma is the subfinal 'D'.