Today is Good Friday of the Lord's Passion. Isaiah 52.13–53.12 is the first reading. I confess that I am not that familiar with the Old Testament, but what Isaiah had prophesied about Christ's suffering 700+ years in advance was amazing! Here are some of the verses from Isaiah 53 I have lumped together.
It was our pain that he bore, our sufferings he endured. He was pierced for our sins, crushed for our iniquity. He bore the punishment that makes us whole, by his wounds we were healed. We had all gone astray like sheep, all following our own way; but the LORD laid upon him the guilt of all. Though harshly treated, he submitted and did not open his mouth, like a lamb let to slaughter. Seized and condemned, he was taken away, though he had done no wrong, nor was deceit found in his mouth. But it was the LORD's will to crush him with pain, by making his life as a reparation offering. My servant, the just one, shall justify the many, their iniquity he shall bear.
There are many other prophecies in the Old Testament which Jesus fulfilled, down to a specific detail in some cases. The Lord God had made the prophets foresee the coming of Christ as our Savior, surely he can make us believe in him as our Savior now that he had already come.