The "law of silence" approach, which assumes that anything is wrong unless it is specifically authorized, is itself not stated in the Bible. I suppose that means that the person who truly tries to follow that approach should reject it. Even if it is followed, that approach does not forbid instruments for all the reasons set out above. Finally, nobody consistently follows that approach, since to do so would require the Lord's Supper meetings to be held at night and upstairs, those details having been specifically noted by Scripture with no alternative examples given.
Most of all, the gospel and the New Testament are not about some pattern of external worship details, as Jesus makes clear in visiting with the Samaritan woman in John 4. What is important is that we worship truly from the heart, motivated by the Holy Spirit and with faith in Jesus Christ ("in spirit/Spirit" and "in truth"). The Mosaic covenant included Leviticus, a book of detailed regulations for worship. The new covenant under Jesus contains nothing like that, a contrast implied by the author of Hebrews (9:1).
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