10:8a We should not commit sexual immorality, as some of them did,

We (incl.) must not sin sexually as some of them sinned.
-or-
We must not do sexual sin. That is what some of them did,

10:8b and in one day twenty-three thousand of them died.

Because of their sin, ⌊sickness⌋ caused twenty-three thousand of those people to die in a single day.
-or-
and in one day twenty-three thousand of them died ⌊because of their sin⌋.

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