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Biblical basis for two aspects of the Gap Theory

According to the Gap Theory there was a large gap in time between Genesis 1:1 and Genesis 1:2. Two aspects of the theory are:

  1. Rather than Genesis 1:1 being a summary for what follows, it is a distinct event in time, followed by another distinct event in time in Genesis 1:2ff.
  2. Satan is thought to have sinned and fallen during the gap, which God judged through a cataclysmic flood (often called Lucifer's flood) that left the world in the empty and void state we read in Genesis 1:2.

What other verses in the Bible support these two propositions?