Matthew 23:16 then those in Judea must flee[k] to the mountains, 17 [l]a person on the housetop must not go down to get things out of his house, 18 a person in the field must not return to get his cloak. 19 Woe to pregnant women and nursing mothers in those days. 20 [m]Pray that your flight not be in winter or on the sabbath, 21 [n]for at that time there will be great tribulation, such as has not been since the beginning of the world until now, nor ever will be.-- you see, they DID face the tribulation of those days. And they endured it and came out. Then they preached that Jesus had destroyed the sacrifices in the temple - superseded it with His supreme sacrifice.
29 [p]“Immediately after the tribulation of those days,34 Amen, I say to you, this generation[t] will not pass away until all these things have taken place.
And that was when the Jesus-movement came out from being just another 2nd temple Jewish sect like the Sadducees, Pharisees, Zealots, Essenes etc.