15:3a For what I received I passed on to you as of first importance:

For ⌊the teaching⌋ that other people taught me, I taught you (plur.) as most important:
-or-
For I told you about ⌊the events⌋ that other people told me. These things are very important:

15:3b that Christ died for our sins according to the Scriptures,

Christ died on account of our (incl.) sins, as the Scriptures say/foretell.
-or-
Christ died because of our sins, which is what the Scriptures said would happen.

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