The resurrection was added much later and copied from a babylonian source. There are no records of testimony from the period, nor records of his existence. We know the origin of the three days narrative, and we know the origin of the rising from the dead narrative. These were added later by other authors. Saul (Paul) made up most of it, from what was possibly a real person who was rebelling against the use of the temple to raise more money – the roman occupation and the introduction of roman gods meant that temple revenues had decreased rapidly, so the priests were ‘drumming up new business’ and it seems likely some zealot rebelled and was imprisoned and killed for it. But there are no ‘testimonies’ and every pretense of testimony we have appears to be a fabrication.