The ordinance of baptism by immersion is commanded by the Scriptures. All who repent and believe on Christ as Saviour and Lord are to be baptized. Thus they declare to the world that they have died with Christ and that they also have been raised with Him to walk in newness of life.
Matt 28:19, Mark 16:16, Acts 10:47, 48, Romans 6:4 Also, 1 Peter 3:18-22
The Lord's Supper, consisting of the elements --bread and the fruit of the vine-- is the symbol expressing our sharing the divine nature of our Lord Jesus Christ (2 Peter 1:4 [KJV/NIV]), a memorial of his suffering and death (1 Corinthians 11:26 [KJV/NIV]), and a prophecy of His second coming (1 Corinthians 11:26 [KJV/NIV]), and is enjoined on all believers "till He come!"
2 Peter 1:4, 1 Cor 11:26