Matthew 5:13 Niv

2 Peter 2:20-21 NIV
If they have escaped the corruption of the world by knowing our Lord and Savior Jesus Christ and are again entangled in it and are overcome, they are worse off at the end than they were at the beginning. It would have been better for them not to have known the way of righteousness, than to have known it and then to turn their backs on the sacred command that was passed on to them.

Colossians 4:6 NIV
Let your conversation be always full of grace, seasoned with salt, so that you may know how to answer everyone.

Hebrews 6:4-6 NIV
It is impossible for those who have once been enlightened, who have tasted the heavenly gift, who have shared in the Holy Spirit, who have tasted the goodness of the word of God and the powers of the coming age and who have fallen away, to be brought back to repentance. To their loss they are crucifying the Son of God all over again and subjecting him to public disgrace.

Leviticus 2:13 NIV
Season all your grain offerings with salt. Do not leave the salt of the covenant of your God out of your grain offerings; add salt to all your offerings.

Luke 14:34-35 NIV
“Salt is good, but if it loses its saltiness, how can it be made salty again? It is fit neither for the soil nor for the manure pile; it is thrown out. “Whoever has ears to hear, let them hear.”

Mark 9:49-50 NIV
Everyone will be salted with fire. “Salt is good, but if it loses its saltiness, how can you make it salty again? Have salt among yourselves, and be at peace with each other.”