Acts 2:2

A sound [η χ ο ς]. See on Luke 4:37.

Of a rushing mighty wind [φ ε ρ ο μ ε ν η ς π ν ο η ς β ι α ι α ς]. Lit., of a mighty wind born along. Pnoh is a blowing, a blast. Only here and ch. 27 25. Rev., as of the rushing of a mighty wind.

The house. Not merely the room. Compare ch. 1 13.

Were sitting. Awaiting the hour of prayer. See ver. 15.