John Gill Commentary Acts 2:44

"And all that believed were together, and had all things common;" — Acts 2:44 (ASV)

And all that believed were together
Not in one place, for no one house could hold them all, their number was now so large; but they "agreed together", as the Arabic version renders it:

all these believers were of one mind and judgment, as to doctrines, they agreed in their sentiments and principles of religion; and they were of one heart and soul, were cordially affected to each other, and mutually were assisting to one another in temporals, as well as in spirituals:

and had all things common :
that is, their worldly goods, their possessions and estates; no man called anything peculiarly his own; and whatever he had, his brother was welcome to, and might as freely take, and use it, as if it was his own.