Commentaries:
Jamieson, Fausset, and Brown
they . . . began to speak with . . . tongues, etc.—real, living languages, as is plain from what follows. The thing uttered, probably the same by all, was "the wonderful works of God," perhaps in the inspired words of the Old Testament evangelical hymns; though it is next to certain that the speakers themselves understood nothing of what they uttered (see on 1Co. 14:1-25).
DESCENT OF THE SPIRIT—THE DISCIPLES SPEAK WITH TONGUES—AMAZEMENT OF THE MULTITUDE. (Acts 2:1-13)
when the day of Pentecost was fully come—The fiftieth from the morrow after the first Passover sabbath (Leviticus 23:15-16).
with one accord—the solemnity of the day, perhaps, unconsciously raising their expectations.
Other Jamieson, Fausset, and Brown entries containing Acts 2:4:
Song of Solomon 4:16
Song of Solomon 6:12
Song of Solomon 7:9
Isaiah 6:7
Isaiah 19:18-22
Acts 2:1-4
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