when He was = in (Greek. en, as in Luk_5:7) His being.
a certain city = one of the cities. Probably one in which "most of His mighty works were done", viz. Chorazin or Bethsaida. When named together these arein this order. By comparing Luk_5:18 and Mar_1:45 with Mar_5:29, Mat_9:10 and Mar_2:15, it seemsthat that certain city was not Capernaum. The attempts to "touch "the Lord were all in that city or neighbourhood (Luk_6:19. Mat_9:20; Mat_14:36. Mar_3:10; Mar_6:56. Compare Luk_5:15). Hence this city was probably Chorazin.
behold. Figure of speech Asterismos.App-6and App-133.
full of leprosy. "Full", in this connection, is a medical word. Compare Col_4:14. See note on Exo_4:6.
on. Greek. epi.App-104. Not the same case asin Luk_5:24. Greek. deomai.App-134.
Lord. Now being proclaimed as to His person: the King, Lord of all and yet (Luk_5:24) the Son of man. Compare Mat_8:2, Mat_8:6, Mat_8:8, Mat_8:20.
if. Denoting a contingent probability. See App-118.