What was commanded to eleven, that no one else knew? But eleven had to teach it to others?
ESV - 20 Teaching them to observe all that I have commanded you. And behold, I am with you always, to the end of the age.
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I would say that, first and foremost (although Jesus did not state it in the form a command), would be His statement that those who believe in Him will receive eternal life (John 3:16). Therefore, ahead of any specific actions or works commanded by Jesus (even the command in Matthew 28:20 to be baptized), would be the indispensable command to have faith in Him for that purpose, which the apostles in turn would have been expected to convey to others. Even that placement of faith, however, is conditioned upon repentance, or contrition over sins that a person has committed, which implies, in turn, recognition of that sin and of the need to forsake it and seek forgiveness for it. (In fact, the first commandment that Jesus was recorded as giving in the gospels (Matthew 3:2) was, "Repent, for the kingdom of heaven is at hand.") With respect to other specific actions mentioned or commanded by Jesus as a means of providing a witness of the salvation that a believer would already have received through faith, I found the summary at the following site to be particularly helpful: https://iblp.org/questions/what-are-commands-christ
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