God is a Spirit: and they that worship him must worship him in spirit and in truth.
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John 4:22-26
Tyndale Open Study Notes (CC BY-SA 4.0).
4:24 in spirit and in truth: One Greek preposition governs both words (literally in spirit and truth) and makes them a single concept. True worship occurs as God’s Spirit reveals God’s truth and reality to the worshiper. Jesus Christ is the Truth (14:6; cp. 14:17; 15:26).
Other Bible passages linked to this one, most cited first.
Now the Lord is that Spirit: and where the Spirit of the Lord is, there is liberty.
This people draweth nigh unto me with their mouth, and honoureth me with their lips; but their heart is far from me. But in vain they do worship me, teaching for doctrines the commandments of men.
For we are the circumcision, which worship God in the spirit, and rejoice in Christ Jesus, and have no confidence in the flesh.
The sacrifices of God are a broken spirit: a broken and a contrite heart, O God, thou wilt not despise.
For thus saith the high and lofty One that inhabiteth eternity, whose name is Holy; I dwell in the high and holy place, with him also that is of a contrite and humble spirit, to revive the spirit of the humble, and to revive the heart of the contrite ones.
But the LORD said unto Samuel, Look not on his countenance, or on the height of his stature; because I have refused him: for the Lord seeth not as man seeth; for man looketh on the outward appearance, but the LORD looketh on the heart.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.