Albert Barnes Commentary 1 Kings 4:25

"And Judah and Israel dwelt safely, every man under his vine and under his fig-tree, from Dan even to Beer-sheba, all the days of Solomon." — 1 Kings 4:25 (ASV)

Under his vine ... — This phrase seems to have been common among the Jews and even among neighboring nations (2 Kings 18:31), to express a time of quiet and security. It is used by the prophets in descriptions of the Messianic kingdom (marginal references).