John 4:24

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

2 Corinthians 3:17

Now the Lord is that Spirit: and where the Spirit of the Lord is, there is liberty.

Matthew 15:8-9

This people draweth nigh to me with their mouth, and honoureth me with their lips; but their heart is far from me.

Philippians 3:3

beware of the concision, For we are the circumcision, who worship God in the spirit, and glory in Christ Jesus, and have no confidence in the flesh.

2 Corinthians 1:12

For this is our rejoicing, the testimony of our conscience, that in simplicity and godly sincerity, not with carnal wisdom, but by the grace of God, we have had our conversation in the world, and more especially toward you.

1 Timothy 1:17

Now to the king of eternity, immortal, invisible, the only God, be honour and glory for ever 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 is that Spirit: and where the Spirit of the Lord is, there is liberty.
1 Timothy 1:17
Now to the king of eternity, immortal, invisible, the only God, be honour and glory for ever and ever, Amen.

Must

Matthew 15:8
This people draweth nigh to me with their mouth, and honoureth me with their lips; but their heart is far from me.
2 Corinthians 1:12
For this is our rejoicing, the testimony of our conscience, that in simplicity and godly sincerity, not with carnal wisdom, but by the grace of God, we have had our conversation in the world, and more especially toward you.