acts 4:31 And when they had prayed, the place was shaken where they were assembled together; and they were all filled with the Holy Ghost, and they spake the word of God with boldness. - Free Bible Online

      31-37. place was shaken--glorious token of the commotion which the Gospel was to make (Ac 17:6; compare Ac 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" (Ac 4:29, 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.

JFB.