Mark 13:23

But do ye beware: behold, I have told you all before.

2 Peter 3:17

Do ye therefore, beloved, as ye know these things before, take heed least being seduced together with them by the error of the wicked, ye should fall from your own stedfastness.

Mark 13:5

But Jesus answered them and said, Beware least any one deceive you:

John 14:29

And now I have told you before it come to pass, that when it cometh to pass ye may believe.

Matthew 7:15

And beware of false prophets, who come to you in sheeps clothing, but inwardly they are ravenous wolves.

Mark 13:9

But look to yourselves; for they will deliver you up to councils, and synagogues: and ye shall be scourged, and set before governors and kings on my account, for a testimony against them.

Mark 13:33

Take heed therefore, watch and pray; for ye know not when the time is:

Luke 21:8

And He said, Take heed that ye be not deceived; for many shall come in my name, saying, I am the Christ; and the time is near: but do not therefore go after them.

Luke 21:34

Take heed to yourselves, least at any time your hearts be overcharged with surfeiting and drunkenness, and the cares of life, and so that day should come upon you unawares:

John 16:1-4

These things have I spoken unto you, that ye may not be offended:

Treasury of Scripture Knowledge

Summary

But take ye heed: behold, I have foretold you all things.

General references

Bible References

Behold

John 14:29
And now I have told you before it come to pass, that when it cometh to pass ye may believe.
John 16:1
These things have I spoken unto you, that ye may not be offended:

General references

Mark 13:33
Take heed therefore, watch and pray; for ye know not when the time is:
Luke 17:23
And they will say to you, Behold, He is here, or behold He is there: but go not after them, nor follow them.