Jesus' comparison of the days of Jonah and Sodom to the present time serves as a warning to his listeners to be ready for the coming judgment and to repent of their sins. It also emphasises the importance of listening to the message of Jesus and responding to it with repentance and faith.
So when the apostle Matthew mentions a prophecy in Matthew 1:21-23, he is quoting from the prophet Isaiah written in 700BC (before Christ incarnate). Is that not mind blowing? The prophecy states in Isaiah 7:14, “Therefore the Lord himself will give you a sign. Behold, the virgin shall conceive and bear a son, and shall call his name Immanuel.”