Final answer:
Jesus advised individuals who had been healed by him and those who witnessed his miracles not to make his identity as the Messiah known, a concept referred to as the Messianic Secret in the New Testament.
Step-by-step explanation:
Who did Jesus warn not to make him known?
During the events depicted in the New Testament, Jesus often urged those around him to be silent about his miracles and his identity as the Messiah. This command for discretion is often referred to as the Messianic Secret. While the Gospels do not systematically single out a particular group, various passages depict instances where Jesus heals someone or performs a miracle and follows it by telling the benefited individuals not to tell others about what he has done. This is largely demonstrated in the Gospel of Mark, for example, after healing a man with an unclean spirit (Mark 1:34, 44) and after bringing Jairus's daughter back to life (Mark 5:43).
There are interpretations as to why Jesus might have wanted to keep his identity secret, including to avoid attracting attention from Roman authorities who might see him as a political threat, as well as to control the public's understanding of his mission which wasn't about earthly power or overthrowing governments, but about spiritual salvation and the kingdom of God.