Matthew 24:15-16

"So when you see the Abomination of Desolation spoken of by the prophet Daniel, standing in the holy place let the reader take note of this,

Matthew 24:32-34

"Learn from the fig tree, her parable; when her branches are become soft, and put forth leaves, you know that summer is near;

Mark 13:14-16

"But when you see the Abomination of Desolation 'standing where he ought not' (let the reader ponder this), then let those in Judea flee to the mountains;

Luke 21:20-21

"But when you see Jerusalem encompassed with armies, then know that her desolation is at hand.

Luke 21:29-33

And he told them a parable.

Treasury of Scripture Knowledge

Summary

And this shall be a sign unto you, saith the LORD, that I will punish you in this place, that ye may know that my words shall surely stand against you for evil:

Bible References

A sign

Matthew 24:15
"So when you see the Abomination of Desolation spoken of by the prophet Daniel, standing in the holy place let the reader take note of this,
Mark 13:14
"But when you see the Abomination of Desolation 'standing where he ought not' (let the reader ponder this), then let those in Judea flee to the mountains;
Luke 21:20
"But when you see Jerusalem encompassed with armies, then know that her desolation is at hand.