Matthew Poole and continuators on 1 Corinthians 3:12

12 Now if any man build upon this foundation, gold, silver, precious stones, wood, hay, stubble .

The Apostle is discoursing metaphorically, he had compared the Church of Corinth to a building, v. 9. and called them there Gods building: they were built upon the Doctrine of the Gospel, the Doctrine of the Apostles and Prophets, who had preached Christ to them, this was the foundation, and had told us, that none, by any pretence of right, could lay any other foundation. But there was to be a superstructure upon this foundation, which might be of various materials, he names six; three very good and excellent, gold, silver, and precious stones; three others vile and invaluable, wood, hay, stubble. By these he either means good or bad works, or rather good or bad Doctrines. Good Doctrine is signified by the gold, silver, and precious stones mentioned. Bad Doctrine by the wood, hay, and stubble mentioned; by which may be understood various degrees of bad Doctrine, as some Doctrines are more pernicious and damnable than others, though the other also be false, unprofitable, trivial, and of no significancy to the good of Souls, but had, as they are unprofitable.