John Calvin Commentary 1 Corinthians 16:10

"Now if Timothy come, see that he be with you without fear; for he worketh the work of the Lord, as I also do:" — 1 Corinthians 16:10 (ASV)

But if Timothy come. He speaks as if he were not yet certain about his coming. Now he charges them concerning Timothy, so that he may be safe with them — not as if he were in danger of his life among them, but because he would face opposition from enemies of Christ. Therefore, he wishes them to carefully take heed that no harm is done to him.

He adds the reason — for he worketh the work of the Lord. From this we infer that the Church of Christ ought to be concerned for the preservation of the lives of ministers. And assuredly, it is reasonable that, to the extent an individual is endowed with superior gifts for the edification of believers and applies himself to it more strenuously, his life ought to be that much dearer to us.

The clause — as I also do, is used either to express his excellence or simply to point out the similarity of their office, since both labored in the word.