There are no contemporary or eyewitness accounts of Jesus at all, not even in the Bible. The authorship traditions of the Canonical Gospels were late 2nd Century additions to originally anonymous works and the majority of critical New Testament scholars do not believe any of those traditions or authentic or that any of the Gospels were written by witnesses or by associates of witnesses. The Epistles attributed to Peter, John, James and Jude are all 2nd Century pseudepigraphal works.

The only source we have who claims to have known Apostles was Paul, who claims to have met Peter, James and John but he says almost nothing about what they told him about Jesus.

The closest thing we have to contemporary mentions of Jesus outside of Christian writings are two passages in Josephus' Antiquities of the Jews and Tacitus' Annals. Neither source is really a contemporary of Jesus. Antiquities was published in the 90's CE, Annals in the early 2nd Century. Neither provides first hand testimony. The main passage in Josephus is universally believed to be at least partially interpolated by Christian forgers. Neither really provides much information (both authors only say that Jesus was crucified under Pilate and that he was the origin of the Christian movement).

The vast majority of historians believe a historical Jesus existed, but there are no first or even secondhand accounts from his lifetime or from anyone who knew him.

A good source for this is Bart Ehrman's textbook, The New Testament: A Historical Introduction as well as Forged for more information on pseudepigraphy.