Acts 1:13

“And when they were come in, etc.] “Into it”, as the Arabic version reads; that is, into the city of Jerusalem, and into some house in that city; but what house it was is needless to inquire, since it cannot be known. Some think it was the house of John the Evangelist, whither he had taken Mary the mother of our Lord, (<431927>John 19:27) which is not improbable: others, that it was the house of Mary, the mother of John Mark, where the disciples met for prayer when Peter was put into prison, (<441212>Acts 12:12) others, that it was the house of Simon the leper; but his house was not at Jerusalem, but in Bethany, (<402606>Matthew 26:6). Some have thought it was the house of Nicodemus, or of…”

“went up into an upper room--perhaps the same "large upper room" where with their Lord they had celebrated the last Passover and the first Supper (Luk 22:12). where abode--not lodged, but had for their place of rendezvous. Peter, &c.--(See on Mat 10:2-4).”

“Were come in - To Jerusalem. They went up into an upper room - The word ὑπερῷον huperoōn, here translated “upper room,” occurs only four times in the New Testament: Acts 9:37, “She (Dorcas) was sick and died; whom when they had washed, they laid her in an upper chamber” (see also Acts 9:39); Acts 20:8, “And there were many lights in the upper chamber where they were gathered together.” The room so designated was an upper chamber used for devotion, or as a place where to lay the dead before burial, or occasionally for conversation, etc. Here it evidently means the place where they were assembled for devotion. Luke 24:53 says they were continually “in the temple” praising and blessing God;…”

“They went up into the upper room - The upper rooms, so frequently mentioned in Scripture, were chambers in the highest part of the house, set apart by the Jews for private prayer. These, on account of their being so retired and convenient, the apostles now used for all the offices of religion. Mat 10:2; Mar 3:14; Luk 6:13. Acts 1:14”

“1:13-26 While the apostles waited for the promised gift of the Holy Spirit (1:4-5), the whole company of 120 disciples in Jerusalem engaged in earnest prayer (1:13-14) and then appointed an apostle to replace Judas Iscariot (1:15-26). 1:13 All eleven of the remaining apostles were present (cp. Matt 10:2-4; Mark 3:16-19; Luke 6:13-16). Judas Iscariot is omitted from this list on account of his betrayal and death (Acts 1:18-19).”

“an: Act 9:37-39, Act 20:8; Mar 14:15; Luk 22:12 Peter: Act 2:14, Act 2:38, Act 3:1-10, Act 4:13, Act 4:19, Act 8:14-25, Act 9:32-43, 10:9-33, Act 12:2, Act 12:3, Act 15:7-11; Mat 4:18-22, Mat 10:2-4; Mar 3:16-18, Mar 5:37, Mar 9:2, Mar 14:33; Luk 6:13-16; Joh 1:40-42, Joh 13:23-25, Joh 18:17, Joh 18:25-27, Joh 21:15-24; 1John 1:1-5:21; Jo2 1:1-13; Jo3 1:1-14; Rev 1:1-3 Philip: Joh 1:43-46, Joh 6:5-7, Joh 12:21, Joh 12:22, Joh 14:8, Joh 14:9 Thomas: Joh 11:16, Joh 20:26-29, Joh 21:2 Matthew: Mat 9:9; Mar 2:14; Luk 5:27-29, Levi James: Act 12:17, Act 15:13; Co1 15:7; Gal 1:19, Gal 2:9; Jam 1:1 Alphaeus: Mar 2:14, Mar 3:18 Simon: Mat 10:4; Mar 3:18, Canaanite, Luk 6:15 Judas: Mat 10:3, Lebbaeus…”