‘Later Jesus said to them again, “I am going away. You will search for me but will die in your sin. You cannot come where I am going.”’ (John 8:21 NLT).

Jesus warned the crowd that he would soon be “going away” and then it would be too late to find Him. Jesus would soon go to the cross and after His resurrection, would ascend to heaven. Those who would not believe in Jesus would ultimately “die in their sins” and therefore be unfit for heaven.
Most of those in the crowd did not believe that Jesus was the Messiah, even though He was with them fulfilling every word the prophets had written. After Christ’s departure, they would continue to “search” for the Messiah, but they would not find him, for he had already come and they had not recognized him.
Now is the time to follow Jesus. Tomorrow may be too late. Therefore, listen to the words of the prophet Isaiah, “Seek the Lord while he may be found; call upon him while he is near” (Isa. 55:6).