Supporting mourningdove's post.
Being in "one accord, one mind"
"It came to pass, as the trumpeters and singers were as one, to make one sound to be heard in praising and thanking the Lord; and when they lifted up their voice with the trumpets and cymbals and instruments of musick, and praised the Lord, saying, For he is good; for his mercy endureth for ever: that then the house was filled with a cloud, even the house of the Lord;" II Chro 5:13
When they assembled in the Upper Room, with the women, they were in one accord in prayer and supplication. They continued to be in one accord on the day of Pentecost and we know how God moved. They continued daily being in one accord in the temple (Acts 1 and 2). When they were told to stop speaking of Jesus, they prayed in one accord (Acts 4). Their prayer is stated in v23-30 and the place was shaken and they spoke the gospel with boldness. They continued in one accord with many signs and wonders. It became apparent who were His followers. Philip preached Christ in Samaria. "And the people with one accord gave heed unto those things which Philip spake, hearing and seeing the miracles which he did." (Acts 8). In Acts 15, after "much disputing," they concluded with what "seemed good unto us, being assembled with one accord,..." "For it seemed good to the Holy Ghost, and to us..." The Holy Spirit lead them how to address the issue and to send out Barnabas and Paul to spread the results of their meeting. (Acts 15).
We are encouraged to be in one accord. In Phillippians 2: "Fulfil ye my joy, that ye be likeminded, having the same love, being of one accord, of one mind.3 Let nothing be done through strife or vainglory; but in lowliness of mind let each esteem other better than themselves" and "Finally, be ye all of one mind, having compassion one of another, love as brethren, be pitiful, be courteous:" (I Pet 3:8) and "Finally, brethren, farewell. Be perfect, be of good comfort, be of one mind, live in peace; and the God of love and peace shall be with you. (II Cor 13"11).
Being united in purpose.