Here the word "received" means that they accepted what Peter said to be true. Alternate translation: "they believed what Peter said" (See: [[rc://en/ta/man/jit/figs-idiom]])
This can be stated in active form. Alternate translation: "about three thousand souls joined the believers on that day" (See: [[rc://en/ta/man/jit/figs-activepassive]])
Here the word "souls" refers to people. Alternate translation: "about 3,000 people" (See: [[rc://en/ta/man/jit/figs-synecdoche]] and [[rc://en/ta/man/jit/translate-numbers]])