The church at Corinth was abusing the Love Feast and the Lord's Supper so the Apostle Paul rebuked them for their unloving attitude and actions.
Jesus' and Paul's teaching on salvation are the same.
Make a joyful noise unto the LORD, all ye lands. Serve the LORD with gladness: come before his presence with singing. Know ye that the LORD he is God: it is he that hath made us, and not we ourselves; we are his people, and the sheep of his pasture. ~ Psalm 100:1-3