Jesus met with his eleven disciples on a mountain before He finally parted from them. When they saw Him, they worshiped Him, but some doubted. He had earlier rebuked some of them because they did not believe the women who had testified of His resurrection. Jesus told them that all authority had been given to Him in heaven and Earth. We need to pause here to think of the magnitude of that statement. That means that all power had been given to Him from the Father which showed He was equal to the Father as the One God. It also meant that Jesus is in control of all things in creation as He is the Creator of all things.
In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God. 3 All things were made through Him, and without Him nothing was made that was made. And the Word became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth. (John 1:1-3; 14)
Jesus told His disciples to go and make disciples of all nations. Jesus was now opening the gift of salvation to also include Gentiles. Previously, salvation was a gift to God’s chosen people Israel, for salvation was of the Jews. Jesus said when speaking to the Samaritan woman at the well:
22 You worship what you do not know; we know what we worship, for salvation is of the Jews. (John 4:22)
Now all men, the world, both Jews and Gentiles, would be recipients of God’s saving grace through faith in Jesus Christ.
16 For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life. (John 3:16)
As part of making disciples of all nations, the disciples were to baptize these people in the name of the Father, of the Son, and of the Holy Spirit. These three are One. This shows the triune nature of God, the Holy Trinity.
The disciples were to teach these people to be obedient to all the commandments of Christ, and Jesus promised them that He would always be with them even to the end of the world. We as Christians are to also go and make disciples of all nations and teach them to be obedient to Jesus in everything.