1. Christ says, "God is a _________: and they that worship him _______ worship him in spirit and in truth" (John 4:24). What is truth? He also says, "... thy (God's) word is truth" (John 17:17). Therefore, man must worship God with a right spirit or attitude and according to His word.

2. Men's worship to God can be vain, if they worship Him by their own innovations. "But in _______ they do worship me (God), teaching for doctrines the commandments of men" (Mat. 15:9).

3. Christians gather on every first day of the week to worship God. "And upon the __________ day of the week, when the disciples came together to break bread ..." (Acts 20:7).

4. Upon every first day of the week, Christians observe the Lord's supper to commemorate the death, burial and resurrection of Jesus Christ ( Mat. 26:26-29; 1 Cor. 11:23-31). "And upon the first day of the week, when the disciples came together to break ________ ..." (Acts 20:7).

5. God's word is to be preached when Christians come together to worship. "And upon the first day of the week, when the disciples came together to break bread, Paul ____________ unto them ..." (Acts 20:7).

6. Prayer is an essential element in worship (1 Thess. 5:17). "And they (Christians) continued steadfastly in the apostles' doctrine and fellowship, and in breaking of bread, and in ___________" (Acts 2:42).

7. Contribution to the cause or work of the church of Christ is another essential element in worship. Paul says, "Now concerning the collection for the saints, as I have given ___________ to the churches of Galatia, even so ______ ______. Upon the _________ day of the week let every one of you lay by him in store, as God hath prospered him ..." (1 Cor. 16:1-2).

8. Christians are to sing praises to God in worship (Col. 3:16; Eph. 5:19). "Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in _______ and _______ and spiritual songs, ____________ with grace in your hearts unto the Lord." Christians use only vocal music to worship God.

Conclusion: We must worship God according to His revealed counsel and with a sincere attitude (John 4:24). If otherwise, we worship Him in vain (Mat. 15:8-9).