Matthew 28:19 – Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, 20 teaching them to observe all that I have commanded you
Context = 3 years face-to-face with God Almighty
God Himself commissioned His disciples to go multiply God after He spent over 1,300 days (3.5 years) face to face with these men. They knew God so well that they knew His tone of voice, His sleeping patterns, His physical smile, the sound of His laughter, the way He dressed, His diet, His confidence, His leadership style, the length and color of His hair, His habits, His family, His work ethic, His singing voice, His desire on display, the fruit of His ministry. Basically, these guys truly knew God, and so He sent them out when He saw the time was fitting.
Galatians 1:1 – Paul, an apostle—not from men nor through man, but through Jesus Christ and God the Father, who raised Him from the dead.