Matthew 15:14

Let them go; they are blind guides of the blind. But if the blind lead the blind, they will both fall into the pit.

Luke 6:39

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

Matthew 23:16-24

Woe to you blind guides, who say, Whoever swears by the temple, it is nothing; but whoever swears by the gold of the temple, he is bound.

1 Timothy 6:5

and wranglings of men of unsound judgments and destitute of the truth, supposing that piety is gain.

2 Peter 2:1

But there were also false prophets among the people, as there shall also be false teachers among you, who shall bring in by stealth destructive heresies, even denying the master that bought them, bringing on themselves swift destruction;

2 Peter 2:17

These are fountains without water, clouds driven by a tempest, to which is reserved the blackness of darkness.

Revelation 19:20

And the beast was taken and with him the false prophet who performed miracles before him, with which he deceived those who received the mark of the beast and those who worship his image; and the two were cast alive into the lake of fire burning with sulphur.

Revelation 22:15

Without are dogs and sorcerers, and fornicators, and murderers and idolaters and whoever loves and practises falsehood.

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 of men of unsound judgments and destitute of the truth, supposing that piety is gain.

They

Matthew 23:16
Woe to you blind guides, who say, Whoever swears by the temple, it is nothing; but whoever swears by the gold of the temple, he is bound.
Luke 6:39
And he spoke also 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 also false prophets among the people, as there shall also be false teachers among you, who shall bring in by stealth destructive heresies, even denying the master that bought them, bringing on themselves swift destruction;
Revelation 19:20
And the beast was taken and with him the false prophet who performed miracles before him, with which he deceived those who received the mark of the beast and those who worship his image; and the two were cast alive into the lake of fire burning with sulphur.
Revelation 22:15
Without are dogs and sorcerers, and fornicators, and murderers and idolaters and whoever loves and practises falsehood.

General references

Mark 8:13
And leaving them, he entered again into the ship, and went away to the other side.
Luke 12:57
And why even of yourselves do you not judge what is right?
Luke 20:8
And Jesus said to them, Neither do I tell you by what authority I do these things.
1 Corinthians 14:38
but if any one is ignorant, let him be ignorant.