John 4:24

God is a Spirit, and it behooveth those who worship Him to worship in spirit and in truth.

2 Corinthians 3:17

But the Lord is a Spirit; and where the Spirit of the Lord is, there is liberty.

Matthew 15:8-9

This people honor me with their lips, but their heart is far from me.

Philippians 3:3

For we are the circumcision, who serve the Spirit of God, and boast in Christ Jesus, also having no confidence in the flesh:

2 Corinthians 1:12

For our boasting is this, the testimony of our conscience, that in holiness and purity of God, not in carnal wisdom, but in the grace of God, we have sojourned in the world, and especially towards you.

1 Timothy 1:17

But to the King of the ages, the incorruptible, invisible, only God, be honor and glory unto the ages of the ages. 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
But the Lord is a Spirit; and where the Spirit of the Lord is, there is liberty.
1 Timothy 1:17
But to the King of the ages, the incorruptible, invisible, only God, be honor and glory unto the ages of the ages. Amen.

Must

Matthew 15:8
This people honor me with their lips, but their heart is far from me.
2 Corinthians 1:12
For our boasting is this, the testimony of our conscience, that in holiness and purity of God, not in carnal wisdom, but in the grace of God, we have sojourned in the world, and especially towards you.