"According to Scripture" 
By Greg Metcalf

And when they were come in, they went up into an upper room, where abode both Peter, and James, and John, and Andrew, Philip, and Thomas, Bartholomew, and Matthew, James the son of Alphaeus, and Simon Zelotes, and Judas the brother of James. These all continued with one accord in prayer and supplication, with the women, and Mary the mother of Jesus, and with his brethren. (Acts 1:13-14)

And when the day of Pentecost was fully come, they were all with one accord in one place. (Acts 2:1)

Accord-homothymadon (G3661) 

Vines Expository-with one mind, with one accord, with one passion
A unique Greek word, used 10 of its 12 New Testament occurrences in the Book of Acts, helps us understand the uniqueness of the Christian community. Homothumadon is a compound of two words meaning to "rush along" and "in unison". The image is almost musical; a number of notes are sounded which, while different, harmonize in pitch and tone. As the instruments of a great concert under the direction of a concert master, so the Holy Spirit blends together the lives of members of Christ's church.
Therefore if there is any consolation in Christ, if any comfort of love, if any fellowship of the Spirit, if any affection and mercy, fulfill my joy by being like-minded, having the same love, being of one accord, of one mind. (Phil 2:1-2)

Accord-sympsychos (G4861)

Vines Expository-of one mind, of one accord
This word is made up of two words syn (together with) and psychos (soul, self, inner life, or the seat of the feelings, desires, affections). So the word refers to being 'united in spirit' or harmonious (BDAG). Paul desired the Philippians to be united in their affections—one in Christ in all desires! Phil 2:2 is the only occurrence of this word in the NT.