Jamieson, Fausset and Brown on Ephesians 6:3

3. long on the earth--In Ex 20:12, "long upon the land which the Lord thy God giveth thee," which Paul adapts to Gospel times, by taking away the local and limited reference peculiar to the Jews in Canaan. The godly are equally blessed in every land, as the Jews were in the land which God gave them. This promise is always fulfilled, either literally, or by the substitution of a higher blessing, namely, one spiritual and eternal (Job 5:26; Pr 10:27). The substance and essence of the law are eternally in force: its accidents alone (applying to Israel of old) are abolished (Ro 6:15).