ye. Representing the kingdom of Mat_5:3 with Mat_4:17.
are = represent. Figure of speech Metaphor.App-6.
salt. Compare Mar_9:50. Luk_14:34, Luk_14:35.
if. See App-118. b, expressing a real contingency; for, if the salt is stored on the bare earth, or is exposed to the air or sun, it does lose its savour and is fit for no place but the streets (see Thomson's The Land and the Book, Lond., 1869, p. 381).
his = its.
of = by. Greek. hupo.
of men. Belongs to former clause, as well, by Figure of speech Ellipsis, App-6.