the verse:

This verse asserts that Narayana, Vasudeva (Krishna), and Vishnu are synonymous. The author and the century in which the above Mahanarayana Upanishad was composed is unknown. The relative chronology of the text, based on its poetic verse and textual style, has been proposed by Parmeshwaranand to the same period of composition as Katha, Isha, Mundaka and Shvetashvatara Upanishads,