Sin is crouching at the door of the White House communications shop. One week after proclaiming chief of staff Reince Priebus his brother, new communications director Anthony Scaramucci offered a clarification: They're brothers all right, sort of "like Cain and Abel."

Though pithy and therefore viral, that reference doesn't really work politically or biblically because Cain had the strength to murder his brother. And, well, he had the decency to kill quickly.

According to the story in Genesis, Cain did his dirty deed secretly, murdering Abel in the fields quietly beyond the view of God or his family. Mooch is doing the opposite.

Angry about his financial disclosures going public, Scaramucci threatened Priebus late Wednesday night. "In light of the leak of my financial disclosure info which is a felony. I will be contacting @FBI and the @TheJusticeDept #swamp @Reince45," he wrote in a since-deleted tweet.

And then this morning, Scaramucci talked more trash about Priebus during an interview on CNN. He called Priebus his brother last week because "we're rough on each other."

Then Scaramucci dropped this cliff-hanger: "Some brothers are like Cain and Abel. Other brothers can fight with each other and get along."

What's most telling about this exchange is that after winking and nodding at fratricide, Scaramucci tries washing his hands of any blood. He insists that it's "up to the president" to decide who lives and who dies. Put another way, the Mooch chokes.

Of course, Scaramucci wishes he could raise the rock over Abel's head. He wants to be the alpha who brings the boulder crashing down and ends the squabble. But he can't do the job. So instead, Scaramucci soaks in hairspray, paints on the TV makeup, and makes a big fuss.

Perhaps he feels empowered by the president to spout off. Possibly Trump has charged him with trash-talking Priebus out of the White House. Honestly though, it's difficult to take any other lesson except a passive-aggressive longing for fratricide from the first week of Scaramucci.

But one thing is certain, and this one thing lends itself to biblical analogy: If Scaramucci ever actually smote Priebus, then that operative's blood will certainly cry out from the ground.

Philip Wegmann is a commentary writer for the Washington Examiner.