on = in. Greek. en.App-104. See the Structure "S" and "S".
a certain day = in one of the days.
that = and.
doctors, &c. = teachers of the law. Greek. nomodida skalos. Occurs only here, Act_5:34, and 1Ti_1:7.
Galilee, . . . Judaea, . . . Jerusalem. Palestine was divided into the three districts (mountain, seashore and valley). Compare Act_1:8; Act_10:39
the LORD = Jehovah. App-98.
to = for, or with a view to. Greek. eis.App-104.
them. TTrm. A WH R. read "him" instead of "them". If so, then the clause reads, "the power of Jehovah: was [present] for Him to heal", but miracles were few "because of their unbelief", Mat_13:58.