Daniel Keller, one of Anna Duggar's brothers, recently slammed Josh Duggar and urged his sister to leave her husband because of his admitted unfaithfulness, which followed reports of Josh having two accounts with Ashley Madison, an adultery website.
Keller shared his feelings on the Facebook page of Jessa Duggar Seewald, one of Josh's sisters, who posted Bible verses that included: "If we say that we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, he is faithful and just to forgive our sins and to cleanse us from all unrighteousness."
According to PEOPLE, Keller wrote in the comments section: "You have to confess and forsake your sin to have mercy. Not sin confess and repeat."
In response to a Facebook commenter, Keller wrote: "Confessing and getting caught are two different things. You want to know what happens when you cover ur sin maybe you should go read ur bible instead of beating people over the head with it."
Keller told another Facebook commenter:
I have told her I would pay for her to move out here w me and pay for her kidz. I don't think josh will see that this is a big deal and be truly broken till that happens. I beat (sic) my life on the fact that Josh has not co.e (sic) to true brokenness yet.
Keller also claimed that his parents "are preaching" to Anna to stay with Josh and are more concerned about how a divorce would look than Anna and the kids getting out and Josh getting help.
Keller also teed off on Josh in another comment: "I told her I would go get her and her children stay w me. She said she's staying where she's at. But I won't stop trying to get that pig out of our family."
Keller repeated the insult in another comment: "I tell you who I don't give a s--- about is that pig she calls her husband."
An unidentified source told PEOPLE last week: "Anna will not leave him. As with her in-laws, she is turning more to her faith than ever. She and Josh are probably praying around the clock right now, I would assume."
Josh and Anna made a Father's Day video (below) for Jim Bob Duggar in June.