Is it possible, that a number of the crowd, that heard Jesus say this to the rich young ruler:

Luke 18:22 Now when Jesus heard these things, he said unto him, Yet lackest thou one thing: sell all that thou hast, and distribute unto the poor, and thou shalt have treasure in heaven: and come, follow me.

That they, later, were at Jerusalem for Pentecost, and were saved after at the preaching of Peter, with possibly Barnabas one of that group?

So that what they heard Jesus say, above, before he finally came to Jerusalem, may have so influenced them?

That right away, they began to follow those words?

Acts 2:44 And all that believed were together, and had all things common;

  45 And sold their possessions and goods, and parted them to all men, as every man had need.

Acts 4:32 And the multitude of them that believed were of one heart and of one soul: neither said any of them that ought of the things which he possessed was his own; but they had all things common.

  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,

  35 And laid them down at the apostles’ feet: and distribution was made unto every man according as he had need.

  36 And Joses, who by the apostles was surnamed Barnabas, (which is, being interpreted, The son of consolation,) a Levite, and of the country of Cyprus,

  37 Having land, sold it, and brought the money, and laid it at the apostles’ feet.

Since it doesn't say that the apostles told them to do that.

Also, the teaching that this is how all Christians should be, may not be completely correct.

Since the other churches started in the new testament didn't all seem to follow that pattern.

Neither did all the new testament epistles, to those other churches, tell the new believers to follow that same pattern.

Also, the narrative doesn't explicitly mention that they only did this at the leading of the Holy Ghost, without any word from the apostles.

That perhaps, they, on their own, decided to follow Jesus' words to the rich young ruler, out of love for Jesus, who had just saved them?

Especially considering that many of the new believers were possibly fired from their jobs, and disinherited from their families, because they believed on Jesus?

Perhaps many of those new believers found themselves instantly poor, without income or home, and definitely in need of physical things?

So the other new believers, who still had lands and houses, may have decided to do what that rich young ruler was too sad to do?

.