John 4:24

God is a spiritual Being, and His worshipers must worship Him in spirit and reality."

2 Corinthians 3:17

Now the Lord means the Spirit, and wherever the Spirit of the Lord is, there is freedom.

Matthew 15:8-9

"'This people honor me with their lips, but their hearts are far, far away from me;

Philippians 3:3

For we are the true circumcision, who by the Spirit of God worship Him, who take pride in Christ Jesus only, and do not rely on outward privileges,

2 Corinthians 1:12

For my boast is this, to which my conscience testifies, that before the world, but especially before you, I have acted from pure motives and in sincerity before God, not depending on worldly wisdom but on God's unmerited favor.

1 Timothy 1:17

To the King eternal, immortal, invisible, the only God, be honor and glory forever and ever! Amen.

Treasury of Scripture Knowledge

Summary

God is a Spirit: and they that worship him must worship him in spirit and in truth.

Bible References

A spirit

2 Corinthians 3:17
Now the Lord means the Spirit, and wherever the Spirit of the Lord is, there is freedom.
1 Timothy 1:17
To the King eternal, immortal, invisible, the only God, be honor and glory forever and ever! Amen.

Must

Matthew 15:8
"'This people honor me with their lips, but their hearts are far, far away from me;
2 Corinthians 1:12
For my boast is this, to which my conscience testifies, that before the world, but especially before you, I have acted from pure motives and in sincerity before God, not depending on worldly wisdom but on God's unmerited favor.