Matthew 15:14

Let them alone; they are blind leaders of the blind; and if the blind lead the blind, both will fall into the pit.

Luke 6:39

And he spoke a parable to them: Can the blind lead the blind? Will not both fall into the pit?

Matthew 23:16-24

Alas for you, blind guides! who say, Whoever shall swear by the temple, it is nothing; but whoever shall swear by the gold of the temple, becomes a debtor.

1 Timothy 6:5

and wranglings, on the part of men who are corrupt in mind, and destitute of the truth, who suppose that godliness is a source of gain. From such withdraw yourself.

2 Peter 2:1

But there were false prophets among the people, as there will be false teachers also among you; and these will stealthily introduce ruinous sects, and deny the Lord that bought them, bringing upon themselves swift destruction:

2 Peter 2:17

These men are fountains without water, clouds driven by a tempest, for whom the gloom of darkness is reserved forever.

Revelation 19:20

And the beast was taken, and the false prophet that was with him, who did signs in his presence, with which he deceived those who received the mark of the beast, and those who worshiped his image. These two were thrown alive into the lake of fire, which burns with brim stone.

Revelation 22:15

With out are dogs and sorcerers and lewd persons and murderers and idolaters, and every one that loves and makes a lie.

Treasury of Scripture Knowledge

Summary

Let them alone: they be blind leaders of the blind. And if the blind lead the blind, both shall fall into the ditch.

Bible References

Let

1 Timothy 6:5
and wranglings, on the part of men who are corrupt in mind, and destitute of the truth, who suppose that godliness is a source of gain. From such withdraw yourself.

They

Matthew 23:16
Alas for you, blind guides! who say, Whoever shall swear by the temple, it is nothing; but whoever shall swear by the gold of the temple, becomes a debtor.
Luke 6:39
And he spoke a parable to them: Can the blind lead the blind? Will not both fall into the pit?

And if

2 Peter 2:1
But there were false prophets among the people, as there will be false teachers also among you; and these will stealthily introduce ruinous sects, and deny the Lord that bought them, bringing upon themselves swift destruction:
Revelation 19:20
And the beast was taken, and the false prophet that was with him, who did signs in his presence, with which he deceived those who received the mark of the beast, and those who worshiped his image. These two were thrown alive into the lake of fire, which burns with brim stone.
Revelation 22:15
With out are dogs and sorcerers and lewd persons and murderers and idolaters, and every one that loves and makes a lie.

General references

Mark 8:13
And he left them, and entered the ship again, and departed to the opposite side.
Luke 12:57
And why even of yourselves do you not judge what is right?
Luke 20:8
And Jesus said to them: Nor do I tell you by what authority I do these things.
1 Corinthians 14:38
But if any one be ignorant, let him be ignorant.