{Into the upper chamber} (eis to huper(9369)on). The upstairs
or upper room (huper is upper or over, the adjective
huper(9369)os), the room upstairs where the women staid in Homer,
then a room up under the flat roof for retirement or prayer ( Ac
9:37,39 ), sometimes a large third story room suitable for
gatherings ( Ac 20:9 ). It is possible, even probable, that this
is the "large upper room" (an(9367)eon mega) of  Mr 14:15  Lu
22:12 . The Vulgate has _coenaculum_ for both words. The word is
used in the N.T. only in Acts. It was in a private house as in
 Lu 22:11  and not in the temple as  Lu 24:53  might imply,
"continually" (dia pantos) these words probably meaning on
proper occasions. {They were abiding} ((8873)an katamenontes).
Periphrastic imperfect active. Perfective use of kata, to abide
permanently. It is possible that this is the house of Mary the
mother of John Mark where the disciples later met for prayer ( Ac
12:12 ). Here alone in the N.T., though old compound. Some MSS.
here read paramenontes. This could mean constant residence, but
most likely frequent resort for prayer during these days, some
being on hand all the time as they came and went. {Simon the
Zealot} (Simon ho Z(886c)(9374)(8873)). Called Simon the Cananaean (ho
Cananaios) in Mt 10:4, Mr 3:18, but Zealot in  Lu 6:16  as
here giving the Greek equivalent of the Aramaic word because Luke
has Gentiles in mind. The epithet (member of the party of
Zealots) clung to him after he became an apostle and
distinguishes him from Simon Peter. See Vol. I on the Gospel of
Matthew for discussion of the four lists of the apostles. {Judas
the son of James} (Joudas Iak(9362)ou). Literally, Judas of James,
whether son or brother (cf.  Jude 1:1 ) we do not really know.
"Of James" is added to distinguish him from Judas Iscariot ( Joh
14:22 ). However we take it, he must be identified with the
Thaddaeus (=Lebbaeus) of Mark and Matthew to make the list in the
third group identical. No name appears in Acts for that of Judas
Iscariot.