So far forth as might relieve the present necessities of believers; not that every one parted with all that he had, for that had taken away (at least) the use and force of the eighth commandment; for where there is no propriety there can be no theft. Now Christ came not to dissolve any law, but to fulfil it: the meaning then is, that these early Christians would not only part with their revenue, but, rather than their brethren should want, they would and did sell their fee simple. See Acts 2:44.
Related Commentaries of Acts 4:34
Acts 4:34
34 Neither was there any among them that lacked: for as many as were possessors of lands or houses sold them, and brought the prices of the things that were sold,