Jewish Talmud, the Roman historian Tacitus, Josephus, Thallus, Pliny, and Lucian to name a few.
I would be happy to hear the citations. But please remember my stipulation: reports of JESUS, not CHRISTIANS or CHRISTIANITY. I have not denied there is evidence of a group, or several groups, called "Christians." I'm looking for JESUS, and him only.
Frankly looking for non-Christian sources usually indicates the bias of the questioner who brushes off the 4 Gospels.
The gospels are rejected because they are filled with lies, misrepresentations and errors, and present as historical fact events that are nowhere mentioned in the writings of historians of the day and shortly afterward, events which, if true, certainly WOULD have been mentioned.
That they are four in stead of fourty is not the problem. The problem is that they are four which do not agree with each other, and in fact contradict each other. Their testimony certainly is not clear.