Baptism
Jesus said:
“All authority in heaven and on earth has been given to me. Go therefore and make disciples of all nations, baptising them in the name of the Father and of the Son and of the Holy Spirit, and teaching them to obey everything I have commanded you. And surely I am with you always, to the end of the age.” (Matthew 28:18–20)
“Let the little children come to me! Don’t hinder them! For the kingdom of God belongs to people such as these.” (Mark 10:14)