Doesn’t Acts 6:3 say that the deacons are in charge of the business of the church when it says “whom we may put in charge of this business”?
That’s quite a stretch, friend.
Assuming the question is serious and not frivolous, I would answer a) the word “business” there means “need” or “lack.” Some translations have it as “this task.” So, we might infer that deacons are in charge of the needs or lacks of the church, whatever is lacking, wherever there is a need.
And b) but neither here in Acts 6 nor in I Timothy 3, where qualifications for deacons are given, do we find specific directions as to the work of deacons. Read on.
Why doesn’t the Bible say what deacons are to do?
It does. It says they are to serve.