The expression “beware lest you also fall” has two implications. Firstly, it means some have fallen. This underscores the wrong teaching of once saved is forever saved. After God saved the entire nation of Israel from Egyptian bondage and baptized them symbolically by taking them through the Red Sea, He went on to destroy many of them. They were destroyed because they stopped being steadfast with the Lord. In 1 Corinthians 12, Paul warns that those who think they stand should be careful, lest they fall. If there is no possibility of departing from the way, that warning would be unnecessary. The second implication flows from the first: since some have fallen before, others can fall now. This call for caution on our part.
The second part of our text shows why some people fell from their steadfastness in the Lord. It was because they were led away by the error of the wicked. The error of the wicked refers to the activities of false teachers. Paul referred to them in his writing to Timothy. “For of this sort are they which creep into houses, and lead captive silly women laden with sins, led away with divers lusts” (2 Timothy 3:6; KJV). Every wrong teaching has the potential to shake you from your steadfastness. This makes the warning of Jesus the more crucial – “Take heed how ye hear”