Some scholars believe that instruments were introduced into worship in 510 A.D. Others contend that Pope Vitalian introduced them in 660. And still others considered expert in the field of religious history list 951, 1250, or even 1290 as possible dates.
But what does it matter when instruments were first introduced? If they were brought in after the days of the New Testament, and thus without sanction, authority, or consideration from inspired penmen, they came too late with no justification.
The early church was taught and encouraged to sing (Ephesians 5:19; Colossians 3:16). Not a word of New Testament Scripture authorizes any other form of music in Christian worship.
We should have little interest in what worshipers were or were not doing in the sixth, seventh, tenth or thirteenth centuries. But we should care, and we can be certain, what faithful brethren were doing in worship during the days of the apostles.
New Testament Christians were heeding the words of heaven, words which still read today as they have read for centuries: “Speaking to yourselves in psalms and hymns and spiritual songs, singing and making melody in your heart to the Lord.” (Ephesians 5:19.)