Paul and Scripture as "for us"

In reading Paul’s letters, I’ve always been struck by his repeated reference that these things in the Old Testament were written "for us."

1 Corinthians 9.10: "Surely he says this for us, doesn't he? Yes, this was written for us, because when the plowman plows and the thresher threshes, they ought to do so in the hope of sharing in the harvest."

Romans 4.…