Salt had various cultural and social meanings in history. Salt was used as a covenant of perpetual obligations. Back then covenants were confirmed by a sacrificial meals and salt was always present at those meals. Because salt was a preservative at that time it was used to symbolize an enduring covenant. When God says to “have salt in yourselves” He could mean to keep God’s enduring covenant of salvation and His return in your heart. Thousands of years ago newborn babies were scrubbed and washed in salt to make their skin more strong and firm. By having salt in yourself you could become more firm in your faith. In the old Testament meat offerings were seasoned with salt to symbolize wisdom. In Mark 9:50 God could also be commanding His people