1 Corinthians 5:1

There is a wide-spread report respecting a case of immorality among you, and that, too, of a kind that does not occur even among the Gentiles-a man, I hear, is living with his father's wife!

James 1:6-8

But let him ask with confidence, never doubting; for the man who doubts is like a wave of the sea driven hither and thither at the mercy of the wind--

2 Peter 2:14

They have eyes only for adulteresses, eyes never tired of sin; they entice weak souls; their minds are trained to covet; they live under a curse.

2 Peter 3:16

It is the same in all his letters, when he speaks in them about these subjects. There are some things in them difficult to understand, which untaught and weak people distort, just as they do all other writings, to their own Ruin.

Treasury of Scripture Knowledge

Summary

Unstable as water, thou shalt not excel; because thou wentest up to thy father's bed; then defiledst thou it: he went up to my couch.

Bible References

Unstable

James 1:6
But let him ask with confidence, never doubting; for the man who doubts is like a wave of the sea driven hither and thither at the mercy of the wind--
2 Peter 2:14
They have eyes only for adulteresses, eyes never tired of sin; they entice weak souls; their minds are trained to covet; they live under a curse.
2 Peter 3:16
It is the same in all his letters, when he speaks in them about these subjects. There are some things in them difficult to understand, which untaught and weak people distort, just as they do all other writings, to their own Ruin.

Because

1 Corinthians 5:1
There is a wide-spread report respecting a case of immorality among you, and that, too, of a kind that does not occur even among the Gentiles-a man, I hear, is living with his father's wife!