Throughout Season 3 of The Righteous Gemstones, it feels like a big tragedy is due. Peter Montgomery (Eli's brother-in-law) was ramping up his militia, stealing material from the Gemstone estate to make bombs. To top it off, he even kidnapped Jesse, Judy and Kelvin, demanding a ransom, only for that to fall apart.
Source:https://www.cbr.com/the-righteous-gemstones-season3-ending-explained/