Breach of faith

"So Saul died for his breach of faith..." (1 Chronicles 10:13 ESV)
Yes, I understand the wages of sin is death. Yes, I know the stories
of Annanais and Sapphira and the story of Uzziah - sin; drop dead; end
of story. Saul didn't drop dead immediately after his sin. It is
clear that he died - a battle injury not quite killing him so he fell
on his own sword to finish the job - BECAUSE of his sin. I like how
the ESV puts it "a breach of his faith". How important is it that we
keep our eyes fixed on Jesus, the author and finisher of our faith?
I'd say there are life and death consequences!