2 Peter 2:14

having eyes full of the adulteress, incessantly sinning, alluring unstable souls; having a heart exercised with insatiable desires; an accursed progeny:

2 Peter 3:16

As, indeed, in all his epistles, speaking in them concerning these things: in which there are some things hard to be understood, which the untaught and unstable wrest, as they do also the other scriptures, to their own destruction.

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

2 Peter 2:14
having eyes full of the adulteress, incessantly sinning, alluring unstable souls; having a heart exercised with insatiable desires; an accursed progeny:
2 Peter 3:16
As, indeed, in all his epistles, speaking in them concerning these things: in which there are some things hard to be understood, which the untaught and unstable wrest, as they do also the other scriptures, to their own destruction.