Expositor's Bible Commentary Commentary Acts 1:12

"Then returned they unto Jerusalem from the mount called Olivet, which is nigh unto Jerusalem, a Sabbath day`s journey off." — Acts 1:12 (ASV)

The disciples had been instructed by Jesus to “stay in the city [of Jerusalem] until you have been clothed with power from on high” (cf. Acts 1:4) and to begin their ministry from that city (Acts 1:8). So they returned to Jerusalem from the Mount of Olives, a distance of “a Sabbath day’s walk from the city” (about two-thirds of a mile).