Salt and light

Salt and light are images used by Jesus in the Sermon on the Mount, one of the main teachings of Jesus on morality and discipleship. These images are in Matthew 5:13, 14, 15 and 16.
The general theme of Matthew 5:13–16 is promises and expectations, and these expectations follow the promises of the first part.
The first verse of this passage introduces the phrase "salt of the earth" :
The second verse introduces "City upon a Hill" :
The later verses refer to not hiding a lamp under a bushel, which also occurs in Luke 8:16–18, and the phrase "Light of the World", which also appears in John 8:12.