From the empty tomb to the ends of the earth

Tintoretto, 1592–1594, Venice. A later painting of the night Jesus gave the Supper.
What the first Christians believed and did
“Christ died for our sins in accordance with the Scriptures, … he was buried, … he was raised on the third day.”
1 Corinthians 15:3–4

Who saves: Christ alone, or Christ plus the law?

Peter said Gentiles are saved “through the grace of the Lord Jesus.” Why did the first council matter so much for the Gospel, and where do we still add the law to Christ today?