Matthew 15:14

Let them alone. They are blind teachers! And if one blind man guides another, they will both fall into the ditch."

Luke 6:39

Then He told them a story: "Can one blind man lead another? Will they not both fall into the ditch?

Matthew 23:16-24

A curse on you, you blind leaders who say, 'Whoever swears by the sanctuary is not duty-bound, but whoever swears by the gold of the sanctuary is duty-bound.'

1 Timothy 6:5

and perpetual friction between people who are depraved in mind and deprived of truth, who imagine that religion is only a means of gain.

2 Peter 2:1

Now there were false prophets among the people, just as there will be false teachers among you too, who will insidiously introduce destructive heresies and deny the Master who has bought them, thus bringing on themselves swift destruction.

2 Peter 2:17

Such men are dried-up springs, clouds driven by the storm, and they are doomed to densest darkness.

Revelation 19:20

Then the wild beast was captured and with him the false prophet who performed wonders in his presence, by which he led astray those who let the mark of the wild beast be put on them and worshiped his statue. Both of them were hurled alive into the fiery lake that burns with brimstone.

Revelation 22:15

The dogs, that is, those who practice magic and immorality, murderers, idolaters, and those who love and practice lying, are on the outside.

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 perpetual friction between people who are depraved in mind and deprived of truth, who imagine that religion is only a means of gain.

They

Matthew 23:16
A curse on you, you blind leaders who say, 'Whoever swears by the sanctuary is not duty-bound, but whoever swears by the gold of the sanctuary is duty-bound.'
Luke 6:39
Then He told them a story: "Can one blind man lead another? Will they not both fall into the ditch?

And if

2 Peter 2:1
Now there were false prophets among the people, just as there will be false teachers among you too, who will insidiously introduce destructive heresies and deny the Master who has bought them, thus bringing on themselves swift destruction.
Revelation 19:20
Then the wild beast was captured and with him the false prophet who performed wonders in his presence, by which he led astray those who let the mark of the wild beast be put on them and worshiped his statue. Both of them were hurled alive into the fiery lake that burns with brimstone.
Revelation 22:15
The dogs, that is, those who practice magic and immorality, murderers, idolaters, and those who love and practice lying, are on the outside.

General references

Mark 8:13
And He left them and again got into the boat and crossed to the other side.
Luke 12:57
Why do you not of yourselves decide what is right?
Luke 20:8
Then Jesus said to them, "Nor am I going to tell you what sort of authority I have for doing as I do."
1 Corinthians 14:38
If anyone ignores it, let him ignore it.