Then the Pharisees and Sadducees came forth and began to dispute with Him, and tempting Him, asked Him to show them a sign out of heaven. But He answered and said to them, "When it is evening, ye say, 'It will be fair weather, for the heaven is red;' and in the morning, 'It will be stormy weather today, for the heaven is red and lowering." Ye know, indeed, how to discern the face of the heaven, can ye not then discern the signs of the times? An evil and adulterous generation seeketh after a sign."
And sighing deeply in His Spirit, He saith, "Why doth this generation seek a sign? Verily I say to you, No sign shall be given to this generation but the sign of Jonah." And leaving them, He embarked again and went away to the other side.