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i think "knower" is a term used by contemporary meditation teachers especially if this "knower" is used in a context outside of 5 skandhas then it might be problematic. (tho not 100% sure, if anyone can provide pali for knower then i would look it up). Unless "knower" from your question means vinnana, consciousness. according to pali texts, mind temporary ceases (while still alive) at cessation meditation level. Mind still exists even at neither perception nor non-perception level.
from what i read, consciousness expands to infinite space at non-form perception (above 4th jhana). "the sphere of infinite space perception"..
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Anapanassati Jhana enter the Access Concentration State when these all happen together for many sitting period continually...
This is the first state we could feel the right knower in the concentration meditation before the Absorption in Concentration.