Acts 4:31

“And when they had prayed, etc.] Either while they were praying, or as soon as they had done; for sometimes, as here, prayer is immediately heard, and an answer is returned, whilst the saints are speaking, or as soon as prayer is ended: the place was shaken where they were assembled together; which, whether it was a private house, or the temple, is not certain: the latter seems more probable, because their number was so great, that no private house could hold them; and since this was the place where they used to assemble; this was now shaken with a rushing mighty wind, as on the day of Pentecost, and was a symbol of the divine presence, and a token that their prayers were heard, and an emblem…”

“place was shaken--glorious token of the commotion which the Gospel was to make (Act 17:6; compare Act 16:26), and the overthrow of all opposing powers in which this was to issue. they were all filled with the Holy Ghost, and spake, &c.--The Spirit rested upon the entire community, first, in the very way they had asked, so that they "spake the word with boldness" (Act 4:29, Act 4:31); next, in melting down all selfishness, and absorbing even the feeling of individuality in an intense and glowing realization of Christian unity. The community of goods was but an outward expression of this, and natural in such circumstances.”

“And when they had prayed - The event which followed was regarded by them as an evidence that God heard their prayer. The place was shaken - The word which is translated “was shaken” commonly denotes “violent agitation,” as the raging of the sea, the convulsion of an earthquake, or trees shaken by the wind, Matthew 11:7; Acts 16:26; Hebrews 12:26. The language here is suited to express the idea of an earthquake. Whether the motion was confined to the house where they were is not said. They probably regarded this as an answer to their prayer, or as an evidence that God would be with them: Because it was sudden and violent, and was not produced by any natural causes; Because it occurred…”

“They were all filled - Afresh; and spake the word with boldness - So their petition was granted. Acts 4:32”

“the place: Act 2:2, Act 16:25, Act 16:26 they were all: Act 2:4 spake: Act 4:29; Isa 65:24; Mat 18:19, Mat 18:20, Mat 21:22; Joh 14:12, Joh 15:7, Joh 15:16, Joh 16:23, Joh 16:24; Jam 1:5 Acts 4:32”