Mark 8:12 in the King James Version
And he sighed deeply in his spirit, and saith, Why doth this generation seek after a sign? verily I say unto you, There shall no sign be given unto this generation.
Context
11 The Pharisees came out and began to question him, seeking from him a sign from heaven and testing him.
12 He sighed deeply in his spirit and said, “Why does this generation seek a sign? Most certainly I tell you, no sign will be given to this generation.”
13 He left them, and again entering into the boat, departed to the other side.