'First' in the Bible

knowing this first, that the scope of no prophecy of scripture is had from its own particular interpretation,

For if after having escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, again entangled, they are subdued by these, their last state is worse than the first.

knowing this first, that there shall come at the close of the days mockers with mocking, walking according to their own lusts,