Question
What does the Bible say about worship? (what worship is, and how God is to be worshiped)
Analysis
Worship in spirit and truth
When a woman asked Jesus where to worship, He redirected the question from place to manner and heart: true worshipers worship the Father 'in spirit and truth' (John 4:23; John 4:24). Worship is not confined to a building, a ritual, or a style; it is the response of a heart that knows God truly ('truth') and engages Him genuinely ('spirit'). That is why the Bible can call ordinary, obedient life, bodies presented to God, 'your spiritual service of worship' (Romans 12:1, BSB): all of life, offered to God, is worship.
What true worship looks like, and what counterfeits it
Scripture is full of worship as praise, thanksgiving, and awe: 'Come, let us sing for joy to the LORD' (BSB, Psalms 95:1; Psalms 95:6), 'enter his gates with thanksgiving' (Psalms 100:4, BSB), singing 'psalms and hymns and spiritual songs' (ASV) with the heart (Ephesians 5:19; Colossians 3:16), and ascribing to God 'the glory due his name' (Psalms 29:2, BSB). Heaven's worship centers on God's worthiness: 'Worthy are you, our Lord and God' (Revelation 4:11, BSB; Revelation 5:12). But the Bible is equally clear about counterfeit worship. God rejects worship that is lip-service while the heart is far away (Isaiah 29:13), and He refuses worship divorced from justice, 'I hate, I despise your feasts… but let justice roll on like a river' (BSB, Amos 5:21; Amos 5:24). And the very first commandment guards worship from idolatry: no other gods (Exodus 20:3).