217. ἅλας hálas; gen. hálatos, neut. noun, equivalent to háls (251). Salt.
(I) Natural salt which purifies, cleanses, and preserves from corruption (Luke 14:34; Sept.: Lev. 2:13; Judg. 9:45). In Matt. 5:13 and Mark 9:50 applied spiritually to the disciples of Christ who were to circulate among and purify the corrupted mass of mankind by their heavenly doctrines and holy examples.
(II) Metaphorically used of wisdom and prudence (Matt. 5:13; Mark 9:50 [cf. Acts 15:9; Col. 4:6; 1 Pet. 1:4; 1 John 3:3])