Verse 5
Before him went the pestilence - This plague was several times inflicted on the disobedient Israelites in the wilderness; see Num 11:33; Num 14:37; Num 16:46; and was always the proof that the just God was then manifesting his power among them.
Burning coals event forth at his feet - Newcome translates, "And flashes of fire went forth after him." The disobedient Israelites were consumed by a fire that went out from Jehovah; see Lev 10:2; Num 11:1; Num 16:35. And the burnt-offering was consumed by a fire which came out from before Jehovah, Lev 11:24.