13 “You are the salt of the earth, but if the salt has lost its flavor, with what will it be salted? It is then good for nothing, but to be cast out and trodden under the feet of men.
Matthew 5:13 Cross References - WEB
Leviticus 2:13
13 Every offering of your meal offering you shall season with salt. You shall not allow the salt of the covenant of your God to be lacking from your meal offering. With all your offerings you shall offer salt.
Mark 9:49-50
Luke 14:34-35
Colossians 4:6
6 Let your speech always be with grace, seasoned with salt, that you may know how you ought to answer each one.
Hebrews 6:4-6
4 For concerning those who were once enlightened and tasted of the heavenly gift, and were made partakers of the Holy Spirit,
5 and tasted the good word of God and the powers of the age to come,
6 and then fell away, it is impossible to renew them again to repentance; seeing they crucify the Son of God for themselves again, and put him to open shame.
2 Peter 2:20-21
20 For if, after they have escaped the defilement of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled in it and overcome, the last state has become worse for them than the first.
21 For it would be better for them not to have known the way of righteousness, than after knowing it, to turn back from the holy commandment delivered to them.