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And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory. Matthew 24:30And then shall they see the Son of man coming in the clouds with great power and glory. Mark 13:26
And then shall they see the Son of man coming in a cloud with power and great glory. Luke 21:27
Behold, he cometh with clouds; and every eye shall see him. Revelation 1:7
Yet a little while, and the world seeth me no more; but ye see me: because I live, ye shall live also. John 14:19
Thanks to the WatchTower Society for pointing out this contradiction. (Reasoning From the Scriptures, p. 313, 342-3)