Mark 8:10-13

And immediately He entered the boat with His disciples and came to the district of Dalmanutha. The Pharisees came out and began to argue with Him, seeking from Him a sign from heaven, to test Him. Sighing deeply in His spirit, He *said, “Why does this generation seek for a sign? Truly I say to you, no sign will be given to this generation.” Leaving them, He again embarked and went away to the other side.