A couple of weeks ago my pastor taught on prayer at Bible study. I’ll have to go back and listen to the teaching again but I don’t believe that something we talked about on the phone made the teaching that night. He was going over Matthew 18 and noticing that vs. 19 is often taken out of context and used to teach that agreement in prayer will produce desired results. The context indicates that the agreement in question concerns binding and loosing brothers/sisters who sin against you.
So he began to ask if we ever see prayers of agreement in Scripture. I didn’t go searching for any at the time but my recent reading in Acts seems to have turned some up. In Acts 1:14 we read that “All these [the apostles] with one accord were devoting themselves to prayer, together with the women and Mary the mother of Jesus and his brothers.” Down in vv. 24-25 we read, “And they prayed and said, ‘You Lord, who know the hearts of all, show which one of these two you have chosen to take the place in this ministry and apostleship from which Judas turned aside to go to his own place.'”
So at the very least, in the case of choosing a replacement for Judas, we see a prayer of agreement that was met with the desired results. I’ll have to keep looking to see if the NT has any other examples but I wouldn’t be surprised to find more. So with that said, even though Matthew 18 is often taken out of context, that’s no reason for believers to stop standing together in agreement and praying for common goals.