"The Land of Israel is likened to a deer, to tell you that just as this deer's skin does not hold its flesh..."

ארץ ישראל נמשלה לצבי לומר לך מה צבי זה אין עורו מחזיק בשרו

This metaphor comes from the Talmud, specifically from Ketubot 112a. It is used to describe the unique quality of the Land of Israel in terms of its fertility and blessing. The comparison to a deer, whose skin does not easily contain its flesh, suggests that the land is exceptionally fertile and productive, able to yield more produce than its size might suggest. This imagery is often used to highlight the special spiritual and physical abundance of the Land of Israel.