Matthew 15:14

Leave them to themselves: they are blind leaders of the blind. But if the blind lead the blind, they will both fall into the pit.

Luke 6:39

And he spake a parable unto them, Can the blind lead the blind? will they not both fall into the pit?

Matthew 23:16-24

Wo unto 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, it is binding.

1 Timothy 6:5

perverse wranglings of men corrupt in mind, and destitute of truth, who think to make gain of godliness; depart from such men.

2 Peter 2:1

BUT there were false prophets among the people, as there will be false teachers also among you, who wickedly introduce damnable heresies, and deny the sovereign Lord who bought them, bringing on themselves swift destruction.

2 Peter 2:17

These are fountains without water, clouds driven by a hurricane; for whom the blackness of darkness for ever is reserved.

Revelation 19:20

And the beast was seized upon, and with him the false prophet who performed the wonders before him, by which he deceived those who received the brand of the beast, and those who worshipped his image. They were both hurled alive into the lake of fire which burneth with brimstone.

Revelation 22:15

But without are dogs, and sorcerers, and whoremongers, and murderers, and idolaters, and every one who 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
perverse wranglings of men corrupt in mind, and destitute of truth, who think to make gain of godliness; depart from such men.

They

Matthew 23:16
Wo unto 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, it is binding.
Luke 6:39
And he spake a parable unto them, Can the blind lead the blind? will they 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, who wickedly introduce damnable heresies, and deny the sovereign Lord who bought them, bringing on themselves swift destruction.
Revelation 19:20
And the beast was seized upon, and with him the false prophet who performed the wonders before him, by which he deceived those who received the brand of the beast, and those who worshipped his image. They were both hurled alive into the lake of fire which burneth with brimstone.
Revelation 22:15
But without are dogs, and sorcerers, and whoremongers, and murderers, and idolaters, and every one who loveth and maketh a lie.

General references

Mark 8:13
And leaving them, going again on board the vessel, he departed to the other side.
Luke 12:57
And why even of yourselves do ye not decide what is just?
Luke 20:8
And Jesus said to them, Neither tell I you by what authority I do these things.
1 Corinthians 14:38
But if any man be ignorant, let him be ignorant.