Jesus said, "But the hour cometh, and now is, when the true worshippers shall worship the Father in spirit and in truth: for the Father seeketh such to worship him. God is a Spirit: and they that worship him must worship him in spirit and in truth" (John 4:23,24). Two things are required of worshippers if our devotions are to be acceptable to God. (1) We must worship in spirit. That is, our hearts must be right. We must be right in life. We must have the correct attitude. We must be thinking of what we are doing (Isaiah 1:11-20; Proverbs 28:9; Matthew 15:8). (2) We must worship God in truth. To worship God in truth means that we will worship God according to the truth. God's Word is truth (John 17:17). Therefore, for our devotions to be acceptable to God, they must be offered in accordance with His Word.
The Lord's Supper or Communion
The Lord's supper or communion (1 Corinthians 10:16) consists of two things:
(1) unleavened bread (without yeast) and (2) the fruit of the vine (grape juice).
The purpose of the Lord's Supper is to bring to our remembrance the sacrifice of the body and blood of Jesus on the cross for our sins (Matthew 26:26-29). We must be very careful when we partake of the communion that we discern the blood and body of Jesus so that we partake in a worthy manner (1 Corinthians 11:23-30). Christians are to eat the the Lord's Supper every first day of every week (Acts 20:7).
Prayers offered to God are to be a part of our public worship as well as our private daily devotions. There are many examples and precepts concerning prayer in the New Testament (1 Timothy 2:1,2,8; Philippians 4:6, etc.). In our prayers to God we give thanks and praise His name. In our prayers we can pray for our needs and for the needs of others. Jesus Christ is our mediator and high priest. Therefore, our prayers must be addressed to God in the name of Jesus (John 16:23; 1 Timothy 2:5; Hebrews 4:14-16; 1 John 2:1,2).
Preaching and Teaching God's Word
God has commanded us to teach His Word (Matthew 28:19,20). Both saved and sinners need to be taught. Therefore, a lesson from the Bible is one of the acts of worship in which Christians are to engage (Acts 2:42). We must learn God's Word so that we can grow stronger in Christ, teach others, and overcome false teachings (1 Peter 2:1,2; 2 Timothy 2:2; 4:1-5). This is a very important part of our worship and must never be overlooked.
Giving of our means is a part of our worship to God. This is the way Christ's church gets the necessary funds to do its work. God has given us the perfect plan for giving (1 Corinthians 16:2). We are told who is to give, "Let every one of you." We are told when we are to give, "Upon the first day of the week." We are also told how much to give, "As God hath prospered us." We show our love for God when we give cheerfully and willingly to Him (2 Corinthians 9:7).
Christians are commanded to praise God in song (Colossians 3:16). The kind of music God has commanded for His church is vocal music only, that is, singing. There is no command or example anywhere in the New Testament for the use of mechanical instrumental music in Christian worship.
To add instruments of music to our singing is a sin for it is adding to what God has told us that He wants. No man has the right to do this (Revelation 22:18,19; 2 John 9-11). We are to "make melody in our hearts" (Ephesians 5:19), the instruments made by God, not instruments made by man!