“Third word” refers to the third of the Ten Commandments, “You shall not bear the name of YHWH your god in vain, the YHWH will not hold him guiltless who bears his name in vain.” The Ten Commandments are referred to as the “Ten Words” (Exodus 34.28).
I should probably do videos in order starting with the First Commandment. But recently I heard Pastor Jeff Meyers’ sermon on the Third Commandment, and hope it will be made public.
When/If it becomes available, I’ll link it. I will probably be doing a video soon, whether it becomes public or not.