Matthew 15:14

Let them alone: they are blind leaders of the blind: but if the blind lead the blind, both will fall into a ditch.

Luke 6:39

And he spoke a parable to them, Can the blind lead the blind? Will they not both fall into a ditch?

Matthew 23:16-24

Wo to you, ye blind guides; who say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, he is bound.

1 Timothy 6:5

evil surmisings, Perverse disputings of men of corrupt minds and destitute of the truth, supposing the gain is godliness. From such withdraw thyself.

2 Peter 2:1

But there were false prophets also among the people, as there shall likewise be false teachers among you, who will privily bring in destructive heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.

2 Peter 2:17

These are wells without water, clouds driven by a tempest, to whom the blackness of darkness is reserved for ever.

Revelation 19:20

And the wild beast was taken, and with him the false prophet, who had wrought the miracles before him, with which he deceived them who had the mark of the wild beast, and them who had worshiped his image. These two were cast alive into the lake of fire burning with brimstone.

Revelation 22:15

Without are dogs, and sorcerers, and whoremongers, and murderers, and idolaters, and every one that loveth and maketh 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
evil surmisings, Perverse disputings of men of corrupt minds and destitute of the truth, supposing the gain is godliness. From such withdraw thyself.

They

Matthew 23:16
Wo to you, ye blind guides; who say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, he is bound.
Luke 6:39
And he spoke a parable to them, Can the blind lead the blind? Will they not both fall into a ditch?

And if

2 Peter 2:1
But there were false prophets also among the people, as there shall likewise be false teachers among you, who will privily bring in destructive heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.
Revelation 19:20
And the wild beast was taken, and with him the false prophet, who had wrought the miracles before him, with which he deceived them who had the mark of the wild beast, and them who had worshiped his image. These two were cast alive into the lake of fire burning with brimstone.
Revelation 22:15
Without are dogs, and sorcerers, and whoremongers, and murderers, and idolaters, and every one that loveth and maketh a lie.

General references

Mark 8:13
And he left them and taking boat again, went to the other side.
Luke 12:57
Yea, and why even of yourselves judge ye not what is right?
Luke 20:8
And they answered, They could not tell whence. Jesus said to them, Neither tell I you, by what authority I do these things.
1 Corinthians 14:38
But if any one is ignorant, let him be ignorant.