Matthew 16:1-5
RSV...And the Pharisees and Sad′ducees came, and to test him they asked him to show them a sign from heaven. 2 ^He answered them,[a] “When it is evening, you say, ‘It will be fair weather; for the sky is red.’ 3 ^And in e morning, ‘It will be stormy today, for the sky is red and threatening.’ You know how to interpret the appearance of the sky, but you cannot interpret the signs of the times. 4 ^An evil and adulterous generation seeks for a sign, but no sign shall be given to it except the sign of Jonah.” So he left them and departed.