How could Matthew relate the words of Jesus (during the agony) if no one was there to hear those words?

Matthew may have relied on the accounts of Jesus' disciples or other witnesses who were present during the events of the agony in the Garden of Gethsemane. Additionally, oral traditions and communal memories within the early Christian community could have preserved these Words. It’s also possible that Matthew, guided by inspiration, depicted the agony to convey theological truths about Jesus’ humanity and suffering. Ultimately, the Gospel serves to emphasize the significance of Jesus' sacrifice rather than to provide a verbatim account.