The word salt is mentioned 57 times in the canon of 66 https://biblescan.com/searchmore.php?q=salt

OT

Leviticus 2:13 Matthew 5:13 Luke 14:34 2 Kings 2:20-21 Ezekiel 43:24 Genesis 14:3 Genesis 19:26 Exodus 30:35 Numbers 34:12 Deuteronomy 29:23 Joshua 15:2 Joshua 15:5 Joshua 15:62 2 Kings 14:7 2 Chronicles 25:11 Job 6:6 Job 39:6 James 3:12 Colossians 4:6 Psalm 107:34 Ezekiel 16:4 Ezra 6:9 Ezra 7:22 Judges 9:45 1 Chronicles 18:12 2 Samuel 8:13 Numbers 18:19 Jeremiah 17:6 2 Chronicles 13:5 Ezekiel 47:11 Joshua 18:19 Deuteronomy 3:17 Joshua 3:16 Numbers 34:3 Joshua 12:3 Zephaniah 2:9 Psalm 60:1 Isaiah 30:24 Jeremiah 48:9 Ezra 4:14 Job 30:4 James 3:11 Ezekiel 47:8-9 Luke 14:35 Leviticus 11:9 Proverbs 25:20 Genesis 14:8 Genesis 14:10 Psalm 141:4 Leviticus 24:7 Joshua 11:8 Joshua 16:8 Psalm 59:17