The verse under consideration is Acts 2.47, the second half:
"And the Lord added to their number day by day those who were being saved."
- Adding to the church is something the Lord does. Only he can do it. Who else can open the eyes of the blind, but the Lord? Who else can bring life to a dead heart, but the Lord? He does this through his church, to be sure... through the faithful worship and works of mercy and Bible teaching of the church, and through the everyday love and witness of its members. But note well that HE does it.
- Being saved means being added to the church. Jesus does not save people without adding them to his church. Salvation and the life of the church go together. If you profess salvation through faith in Jesus Christ but are estranged from his church, something is very wrong and very broken.
- In the book of Acts, Jesus was doing these things "day by day." This was not an occasional thing; it was not a big, special event kind of thing. It was a daily thing, as regular and on-going as their worship and life together. Now, notice the word "and" at the beginning of the verse. We should check out what was going on before the "and," right? In vs.42-47a, the church's worship and life together were described. This is what the Lord was crowning and honoring, "day by day," with converts. If we want to see more of v.47b, perhaps the place to start is v.42... working and praying our way there.