Side line: “kata sarka” (according to the flesh) must be taken as adverbial, it qualifies verbs for “knowing” – how they know or in this sense not knowing – “not according to the flesh.”
A phrasal verb is a two-word, sometimes 3-word combination of a verb plus another word, usually an adverb, like break up, or a preposition, like sleep on: Let me sleep on it.
Language experts say that this written form is appearing more frequently these days and may be based on the idea that the expression is similar to the adverbs " already" and " altogether" .