We do not. The truth is, we have basically no first-hand accounts from that era. The very earliest written mentions of Jesus come from the second half of the first century, some forty years after his death.

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The following topic doesn't precisely answer your question, but it does discuss what we know about Jesus as an actual historical individual, in particular the early historical accounts: https://www.reddit.com/r/AskHistorians/comments/259vcd/how_much_evidence_is_there_for_a_historical_jesus/chf3t4j/?context=3

The first source we have outside of the Bible that mentions Jesus is Josephus. Josephus was a Pharisaic Jew who ended up surrendering during the first Jewish War and then switched sides to the Romans, where he was employed as a historian. He writes about Jesus in the Antiquity of the Jews. There are a few issues with the longer passage, called the Testimonium Flavianum as it is clear there are some later interpolations there.

One of the best dealings with the passage comes from John P. Meier in A Marginal Jew, volume two. He breaks down the passage and isolates the historic core. In this passage, Josephus says that Jesus was a doer of startling deeds. So that would be our earliest historical evidence that Jesus was said to have performed miracles.

Jesus wasn't alone in performing so called miracles though. Josephus mentions numerous others who did startling deeds, or miracles. It wasn't something all the unique for Jesus.

Morton Smith wrote a great work on this called Jesus the Magician (the updated version has an introduction written by Bart Ehrman where he states that in antiquity, magic was real. It was something simply accepted). Smith goes over the records we have about magic in and around the first century, as well as what we have on Jesus, and concludes that the earliest followers would have seen Jesus as a magician.

Smith's work is a bit controversial. But he does a great job of also showing that outsiders, when talking of Jesus, often said he did miracles, such as with Josephus, or with Celsus, who accuses Jesus of doing magic. Smith also looks at what he calls familiar social type in the ancient world, that of a magician, and compares it to how Jesus is spoken of in the New Testament. For Smith, the two fit really well.

As a whole, the evidence we have is scant. Interestingly enough, a marine archaeologist by the name of Frank Goddio did fine a cup from the first century that appears to say, "the magician through Christ" in Greek. Goddio found it in 2008. Not much has been said about it since then. Craig A Evans, in Jesus as Savior and Protector-Before and Easter and After, mentions that study of the cup is still in just the beginning phases, and no definite conclusion can be made. However, as Evans points out, this sort of inscription isn't wholly unique as later charms and pendants have been found that clearly invoke the name of Jesus.