Why wouldn't the early believers have needed to sell their houses and lands if Israel had accepted the kingdom?
Had Israel accepted the kingdom, the utopia everyone seeks would have arrived, so believers would not have needed personal houses or lands. Their selling of property into a common fund reflected that expectation. When Israel rejected the kingdom, the fund ran out, leaving them destitute.
Les explains that early in Acts the believers sold their lands and houses and put the money into a common kitty, so everybody lived on it. Acts 2 and Acts 3 say all things were common and no one lacked. But such a common fund eventually runs out, just as endless handouts exhaust resources. Had Israel accepted the kingdom, they would not have needed houses and lands, because everything would have been the utopia everyone still looks for. But Israel rejected the kingdom, the kingdom did not come in, their kitty ran out, and they became destitute. Yet God in His sovereignty watched over them by moving Gentile believers of Paul's gospel to give offerings for the poor saints at Jerusalem.