Matthew 7:14

How narrow is the gate, and restricted is the way that leads to life! Few are those who find it.

Acts 14:22

confirming the souls of the disciples, exhorting them to continue in the faith, and that through many afflictions we must enter into the Kingdom of God.

Proverbs 4:26-27

Make the path of your feet level. Let all of your ways be established.

Proverbs 8:20

I walk in the way of righteousness, in the midst of the paths of justice;

Isaiah 30:21

and when you turn to the right hand, and when you turn to the left, your ears will hear a voice behind you, saying, "This is the way. Walk in it."

Isaiah 35:8

A highway will be there, a road, and it will be called The Holy Way. The unclean shall not pass over it, but it will be for those who walk in the Way. Wicked fools will not go there.

Isaiah 57:14

He will say, "Cast up, cast up, prepare the way, take up the stumbling-block out of the way of my people."

Jeremiah 6:16

Thus says Yahweh, "Stand in the ways and see, and ask for the old paths, 'Where is the good way?' and walk in it, and you will find rest for your souls. But they said, 'We will not walk in it.'

Matthew 16:24-25

Then Jesus said to his disciples, "If anyone desires to come after me, let him deny himself, and take up his cross, and follow me.

Matthew 20:16

So the last will be first, and the first last. For many are called, but few are chosen."

Matthew 22:14

For many are called, but few chosen."

Matthew 25:1-12

"Then the Kingdom of Heaven will be like ten virgins, who took their lamps, and went out to meet the bridegroom.

Mark 8:34

He called the multitude to himself with his disciples, and said to them, "Whoever wants to come after me, let him deny himself, and take up his cross, and follow me.

Luke 12:32

Don't be afraid, little flock, for it is your Father's good pleasure to give you the Kingdom.

Luke 13:23-30

One said to him, "Lord, are they few who are saved?" He said to them,

John 15:18-20

If the world hates you, you know that it has hated me before it hated you.

John 16:2

They will put you out of the synagogues. Yes, the time comes that whoever kills you will think that he offers service to God.

John 16:33

I have told you these things, that in me you may have peace. In the world you have oppression; but cheer up! I have overcome the world."

Romans 9:27-29

Isaiah cries concerning Israel, "If the number of the children of Israel are as the sand of the sea, it is the remnant who will be saved;

Romans 9:32

Why? Because they didn't seek it by faith, but as it were by works of the law. They stumbled over the stumbling stone;

Romans 11:5-6

Even so then at this present time also there is a remnant according to the election of grace.

Romans 12:2

Don't be conformed to this world, but be transformed by the renewing of your mind, so that you may prove what is the good, well-pleasing, and perfect will of God.

Ephesians 2:2-3

in which you once walked according to the course of this world, according to the prince of the power of the air, the spirit who now works in the children of disobedience;

1 Thessalonians 3:2-5

and sent Timothy, our brother and God's servant in the Good News of Christ, to establish you, and to comfort you concerning your faith;

1 Peter 3:20-21

who before were disobedient, when God waited patiently in the days of Noah, while the ship was being built. In it, few, that is, eight souls, were saved through water.

Treasury of Scripture Knowledge

Summary

Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.

Bible References

Because

Matthew 16:24
Then Jesus said to his disciples, "If anyone desires to come after me, let him deny himself, and take up his cross, and follow me.
Proverbs 4:26
Make the path of your feet level. Let all of your ways be established.
Proverbs 8:20
I walk in the way of righteousness, in the midst of the paths of justice;
Isaiah 30:21
and when you turn to the right hand, and when you turn to the left, your ears will hear a voice behind you, saying, "This is the way. Walk in it."
Isaiah 35:8
A highway will be there, a road, and it will be called The Holy Way. The unclean shall not pass over it, but it will be for those who walk in the Way. Wicked fools will not go there.
Isaiah 57:14
He will say, "Cast up, cast up, prepare the way, take up the stumbling-block out of the way of my people."
Jeremiah 6:16
Thus says Yahweh, "Stand in the ways and see, and ask for the old paths, 'Where is the good way?' and walk in it, and you will find rest for your souls. But they said, 'We will not walk in it.'
Mark 8:34
He called the multitude to himself with his disciples, and said to them, "Whoever wants to come after me, let him deny himself, and take up his cross, and follow me.
John 15:18
If the world hates you, you know that it has hated me before it hated you.
John 16:2
They will put you out of the synagogues. Yes, the time comes that whoever kills you will think that he offers service to God.
Acts 14:22
confirming the souls of the disciples, exhorting them to continue in the faith, and that through many afflictions we must enter into the Kingdom of God.
1 Thessalonians 3:2
and sent Timothy, our brother and God's servant in the Good News of Christ, to establish you, and to comfort you concerning your faith;

General references

Numbers 4:48
even those who were numbered of them, were eight thousand five hundred eighty.
Proverbs 2:9
Then you will understand righteousness and justice, equity and every good path.
Proverbs 14:12
There is a way which seems right to a man, but in the end it leads to death.
Matthew 22:14
For many are called, but few chosen."
Romans 3:17
The way of peace, they haven't known."