Romans 9:32

And why? Because they were pursuing a righteousness which should arise not from faith, but from what they regarded as merit. They stuck their foot against the stone which lay in their way;

1 Peter 2:8

and "a Stone for the foot to strike against, and a Rock to stumble over." Their foot strikes against it because they are disobedient to God's Message, and to this they were appointed.

Matthew 13:57

So they turned angrily away from Him. But Jesus said to them, "There is no prophet left without honour except in his own country and among his own family."

Matthew 19:16-20

"Teacher," said one man, coming up to Him, "what that is good shall I do in order to win the Life of the Ages?"

Luke 2:34

Symeon blessed them and said to Mary the mother, "This child is appointed for the falling and the uprising of many in Israel and for a token to be spoken against;

Luke 7:23

And blessed is every one who does not stumble and fall because of my claims."

John 6:27-29

Bestow your pains not on the food which perishes, but on the food that remains unto the Life of the Ages--that food which will be the Son of Man's gift to you; for on Him the Father, God, has set His seal."

Acts 16:30-34

and, bringing them out of the prison, he exclaimed, "O sirs, what must I do to be saved?"

Romans 4:16

All depends on faith, and for this reason--that acceptance with God might be an act of pure grace,

Romans 10:3

Ignorant of the righteousness which God provides and building their hopes upon a righteousness of their own, they have refused submission to God's righteousness.

Romans 11:11

I ask, however, "Have they stumbled so as to be finally ruined?" No, indeed; but by their lapse salvation has come to the Gentiles in order to arouse the jealousy of the descendants of Israel;

1 Corinthians 1:23

while we proclaim a Christ who has been crucified--to the Jews a stumbling-block, to Gentiles foolishness,

1 John 5:9-12

If we accept the testimony of men, God's testimony is greater: for God's testimony consists of the things which He has testified about His Son.

Treasury of Scripture Knowledge

Summary

Wherefore? Because they sought it not by faith, but as it were by the works of the law. For they stumbled at that stumblingstone;

Bible References

Because

Romans 4:16
All depends on faith, and for this reason--that acceptance with God might be an act of pure grace,
Romans 10:3
Ignorant of the righteousness which God provides and building their hopes upon a righteousness of their own, they have refused submission to God's righteousness.
Matthew 19:16
"Teacher," said one man, coming up to Him, "what that is good shall I do in order to win the Life of the Ages?"
John 6:27
Bestow your pains not on the food which perishes, but on the food that remains unto the Life of the Ages--that food which will be the Son of Man's gift to you; for on Him the Father, God, has set His seal."
Acts 16:30
and, bringing them out of the prison, he exclaimed, "O sirs, what must I do to be saved?"
1 John 5:9
If we accept the testimony of men, God's testimony is greater: for God's testimony consists of the things which He has testified about His Son.

They stumbled

Romans 11:11
I ask, however, "Have they stumbled so as to be finally ruined?" No, indeed; but by their lapse salvation has come to the Gentiles in order to arouse the jealousy of the descendants of Israel;
Matthew 13:57
So they turned angrily away from Him. But Jesus said to them, "There is no prophet left without honour except in his own country and among his own family."
Luke 2:34
Symeon blessed them and said to Mary the mother, "This child is appointed for the falling and the uprising of many in Israel and for a token to be spoken against;
Luke 7:23
And blessed is every one who does not stumble and fall because of my claims."
1 Corinthians 1:23
while we proclaim a Christ who has been crucified--to the Jews a stumbling-block, to Gentiles foolishness,

General references

Matthew 19:30
"But many who are now first will be last, and many who are now last will be first.
Mark 10:31
But many who are now first will be last, and the last, first."
Luke 7:23
And blessed is every one who does not stumble and fall because of my claims."
Romans 4:4
But in the case of a man who works, pay is not reckoned a favour but a debt;