Matthew 11:16-17
"But to what shall I compare the present generation? It is like children sitting in the open places, who call to their playmates.
Matthew 17:17
"O unbelieving and perverse generation!" replied Jesus; "how long shall I be with you? how long shall I endure you? Bring him to me."
Mark 9:19
"O unbelieving generation!" replied Jesus; "how long must I be with you? how long must I have patience with you? Bring the boy to me."
Luke 7:31-32
"To what then shall I compare the men of the present generation, and what do they resemble?
Luke 18:8
Yes, He will soon avenge their wrongs. Yet, when the Son of Man comes, will He find faith on earth?"
2 Thessalonians 3:2
and that we may be delivered from wrong-headed and wicked men; for it is not everybody who has faith.
Hebrews 11:6
But where there is no faith it is impossible truly to please Him; for the man who draws near to God must believe that there is a God and that He proves Himself a rewarder of those who earnestly try to find Him.