1 Corinthians 3:13 is simple. 'The day' is referenced and it is emphatic in the original. There is only one day which could be spoken of this way: "the day of our Lord Jesus Christ." 1 Corinthians 1:8

The events described here are happening at the same time. There is no indication that the purification is happening before Christ comes but as or when Christ comes. This is indicated by the reward that Christ gives, which shall be manifest only on the last day.

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Rev. Daniel Kok
Pastor of Grace Reformed Church (URCNA)
Leduc, Alberta CANADA
Church Blog

"there is no creature, either in heaven or on earth, who loves us more than Jesus Christ"
Belgic Confession, Article 26

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