'First' in the Bible

Knowing this first, that no prophecy of the scripture is of any private interpretation.

For if, having escaped the world’s impurity through the knowledge of our Lord and Savior Jesus Christ, they are again entangled in these things and defeated, the last state is worse for them than the first.

My loved ones, this is now my second letter to you, and in this as in the first, I am attempting to keep your true minds awake;

Knowing this first, that there shall come in the last days scoffers, walking after their own lusts,