Command or Forbid

Churches that use instruments often fall back on an argument that God never forbids instruments. This is true, but it isn't the only issue. The apostles  actually use the lack of a positive command to say something isn't implemented.

Act 15:24  Forasmuch as we have heard, that certain which went out from us have troubled you with words, subverting your souls, saying, Ye must be circumcised, and keep the law: to whom we gave no such commandment: 

The lack of a commandment from Christ or the apostles would cast doubt whether it is God's will. Even if God does not forbid a commandment from the law of Moses it would not be true God wanted it in the New Covenant. The question is whether God requires a positive commandment for everything in the New Covenant.

It might be true that God said in later scriptures that the death of Christ took away the Old Covenant and his blood ratified the New Covenant. At the time of the Acts 15 dispute I know of no writing that addressed the issue of keeping the law or elements within the law. I would think that all were asked to wait for the Holy Spirits guidance before commanding different elements.

Paul and Barnabas certainly rejected the idea of making elements from the Law of Moses necessary.

Since there is no clear positive commandment for instruments it is doubtful they should be included in Christian worship. Christ took away the Law of Moses and never included a positive command in the New.

His will was expressed in taking away the old.