Matthew Poole and continuators on 2 Peter 3:17

17 Ye therefore, beloved, seeing ye know these things before-hand, beware lest ye also being led away by the error of the wicked, fall from your own stedfastness .

Which I have been now writing to you of, viz. That the Judge will certainly come; or, that Hereticks, Deceivers, and Scoffers will come; or both may be comprehended.

As well as others have been.

The stedfastness of your Faith. This Admonition he gives them not to discourage them with fear of Apostacy, but to awaken them to that holy care, which would be a means to prevent it; and so to keep them from security, and trust in themselves, not to weaken their Faith, and Reliance on the Promise.

Marginal references: Mark 13.23.