Go to this link, sister.
http://www.sacrednamebible.com/kjvstrongs/index2.htm
On the left side is a column of list of Bible books and numbers of chapters in each book listed. Scroll down to Revelation and click on the number 3 for the 3rd chapter.
Then the main upper page should be showing Revelation 3rd chapter. Scroll down to verse 5 and click on the two Greek words in blue "ou mh" and the bottom of the main page should show you the definition for those 2 Greek words below.
"i.e. ou - ou
3756 and mh - me
3361; a double negative strengthening the denial; not at all:--any more, at all, by any (no) means, neither, never, no (at all), in no case (wise), nor ever, not (at all, in any wise). Compare mh ouk - me ouk
3378."
That means He will never do that.. ever.. under no circumstances. Why?
John 6:39
And this is the Father's will which hath sent me, that of all which he hath given me I should lose nothing, but should raise it up again at the last day. 40 And this is the will of him that sent me, that every one which seeth the Son, and believeth on him, may have everlasting life: and I will raise him up at the last day.
That is the Father's will and Jesus's promise to us as our Saviour. That is His glory in keeping us as saved forever.