Meaning
The figurative use of the word in Mt 18:19 makes it of special interest. The word there is sumphoneo, from which comes our word symphony, meaning a harmonious blending. This agreement therefore is complete. Three persons are introduced: two human beings and the Father. They are in perfect agreement on the subject or purpose under consideration. It is therefore an inward unity produced by the Holy Spirit leading the two into such an agreement with the Father. There will follow then, as a matter of course, what is promised in Mat 18:19, Mat 18:20. In Ac 5:9 it sets forth the justice of Peter in dealing in the same manner in both cases. Ananias and Sapphira were in perfect agreement and equally guilty (Luk 5:36, Act 15:15).
Jacob W. Kapp