Thanks for sharing your question with us.
There is not native functionality that limits the posting to the users that you have hand-picked. However, there are some alternatives that you might find helpful:
1. Give users an "admin" or "moderator" role, then in your content type settings, only allow those roles to be able to post. You can learn more here6.
2. Enable your moderation app and only allow the users with a "verified email address" to post in the community without your approval. The rest will go to the moderation panel for your approval first.