BSA_en_tn/jos/14/09.md

the land ... will be an inheritance for you and for your children forever

The land that Caleb and his descendants would have is spoken of as if it were an inheritance that they would receive as a permanent possession. (See: rc://en/ta/man/translate/figs-metaphor)

the land on which your foot has walked

Here "your foot" represents Caleb. Alternate translation: "the land on which you have walked" (See: rc://en/ta/man/translate/figs-synecdoche)