'Fig tree' in the Bible

I found Israel like grapes in the wilderness [an unexpected and refreshing delight];I saw your fathers (ancestors) as the first ripe fruit on the fig tree in its first season,But they came to Baal-peor and consecrated themselves to shamefulness [the worship of Baal],And [because of their spiritual and physical adultery] they became as detestable and loathsome as the thing they loved.