John Calvin Commentary Ephesians 6:3

"that it may be well with thee, and thou mayest live long on the earth." — Ephesians 6:3 (ASV)

That it may be well with you. The promise is—a long life, from which we are led to understand that the present life is not to be overlooked among the gifts of God. On this and other related subjects, I must refer my reader to the Institutes of the Christian Religion; for now, I will content myself with saying, in a few words, that the reward promised to the obedience of children is highly appropriate. Those who show kindness to their parents, from whom they received life, are assured by God that in this life it will be well with them.

And that you may live long on the earth. Moses expressly mentions the land of Canaan.

That your days may be long upon the land which
the Lord your God gives you (Exodus 20:12).

Beyond this, the Jews could not conceive of any life more happy or desirable. But as the same divine blessing is extended to the whole world, Paul has properly omitted mentioning a place whose peculiar distinction lasted only until the coming of Christ.