And when the day of Pentecost was fully come, they were all with one accord in one place.
Descent of the Spirit-The Foreign Tongues (Acts 2:1-4)
And when the day of Pentecost - the second of the three annual Jewish festivals, designed to celebrate the ingathering of the wheat-harvest, as the Passover celebrated the barley-harvest. In the Old Testament it is called "the feast of weeks," because observed after the lapse of 'a week of weeks,' or seven full weeks from the morrow after that first Passover-sabbath (Leviticus 23:15-16). It was called "Pentecost," by the Greek-speaking Jews, because observed on the fiftieth day after the time just mentioned. (Both names occur in Tob 2:1 .)
Was fully come, х en (G1722) too (G3588) sumpleerousthai (G4845)] - more correctly 'was getting fulfilled,' or 'was getting full;' that is, the preceding evening had passed away-which was reckoned part of the day on which they had entered-and the great Pentecostal day itself had so far advanced as to be 'getting full.' (Compare the same sense of this word in Luke 8:23, and see the note at Mark 4:37, and at Luke 9:51.) Our translators, though supported by some of the best critics in their rendering of the word, have certainly put more into it than it strictly expresses and seems here plainly to mean.
They were all with one accord, х homothumadon (G3661)] - see the note at Acts 1:14; but the true reading here appears to be 'together' х homou (G3674), simul, or pariter, as in the Vulgate].
In one place - the solemnity of the day perhaps unconsciously raising in them an expectation of something that would signalize it. The conjecture (of Olshausen, Baumgarten, Lange, and others) that the "place" here alluded to was one of the temple-courts is a most improbable one. Besides the unsuitableness of such a place, there is every reason to rely on the ancient tradition, that it was the same "upper room" (Acts 1:13) where, ever since their return from Mount Olivet, they had daily congregated for prayer and supplication, and where a church was afterward erected which stood for centuries.