The phrase "true worshippers" refers to people who genuinely and sincerely worship or honor something or someone, with pure faith and devotion. They are dedicated followers who express their true belief and reverence. Full definition
Again,» The hour is coming, and now is, when true worshippers will worship the Father in spirit and in truth» (iv. (religion-online.org)
This is why Jesus says in John 4 that true worshippers worship God in spirit and in truth. (redeeminggod.com)
[39] They are consecrated as priests of the New Covenant to lead «true worshippers [who] will worship the Father in spirit and in truth.» (faith.org.uk)