Matthew 15:14

Let them be; they are but blind guides; and, if one blind man guides another, both of them will fall into a ditch."

Luke 6:39

Then, speaking in parables, Jesus said: "Can one blind man guide another? Will they not both fall into a ditch?

Matthew 23:16-24

Alas for you, you blind guides! You say 'if any answer by the Temple, his oath counts for nothing; but, if any one swears by the gold of the Temple, his oath is binding him'!

1 Timothy 6:5

and incessant wrangling on the part of these corrupt-minded people who have lost all hold on the Truth, and who think of religion only as a source of gain.

2 Peter 2:1

But there were false prophets also in the nation, just as there will be false teachers among you, men who will secretly introduce ruinous divisions, disowning even the Lord who bought them, and bringing speedy Ruin upon themselves.

2 Peter 2:17

These men are like springs without water, or mists driven before a gale; and for them the blackest darkness has been reserved.

Revelation 19:20

The Beast was captured, and with him was taken the false Prophet, who performed the marvels before the eyes of the Beast, with which he deceived those who had received the brand of the Beast and those who worshiped his image. Alive, they were thrown, both of them, into the fiery lake 'of burning sulphur.'

Revelation 22:15

Outside will be the filthy, the sorcerers, the impure, the murderers, the idolaters, and all who love the false and live it.'

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 incessant wrangling on the part of these corrupt-minded people who have lost all hold on the Truth, and who think of religion only as a source of gain.

They

Matthew 23:16
Alas for you, you blind guides! You say 'if any answer by the Temple, his oath counts for nothing; but, if any one swears by the gold of the Temple, his oath is binding him'!
Luke 6:39
Then, speaking in parables, Jesus said: "Can one blind man guide another? Will they not both fall into a ditch?

And if

2 Peter 2:1
But there were false prophets also in the nation, just as there will be false teachers among you, men who will secretly introduce ruinous divisions, disowning even the Lord who bought them, and bringing speedy Ruin upon themselves.
Revelation 19:20
The Beast was captured, and with him was taken the false Prophet, who performed the marvels before the eyes of the Beast, with which he deceived those who had received the brand of the Beast and those who worshiped his image. Alive, they were thrown, both of them, into the fiery lake 'of burning sulphur.'
Revelation 22:15
Outside will be the filthy, the sorcerers, the impure, the murderers, the idolaters, and all who love the false and live it.'

General references

Mark 8:13
So he left them to themselves, and, getting into the boat again, went away to the opposite shore.
Luke 12:57
Why do not you yourselves decide what is right?
Luke 20:8
"Then I," said Jesus, "refuse to tell you what authority I have to do these things."
1 Corinthians 14:38
Any one who ignores it may be ignored.