"“There were in the church that was at Antioch certain prophets and teachers; as Barnabas, and Simeon that was called Niger, and Lucius of Cyrene, and Manaen, ... and Saul. As they ministered to the Lord, and fasted, the Holy Ghost said, Separate Me Barnabas and Saul for the work whereunto I have called them.” Before being sent forth as missionaries to the heathen world, these apostles were solemnly dedicated to God by fasting and prayer and the laying on of hands. Thus they were authorized by the church, not only to teach the truth, but to perform the rite of baptism and to organize churches, being invested with full ecclesiastical authority. AA 160.2"
"Now there were in the church that was at Antioch certain prophets and teachers; as Barnabas, and Simeon that was called Niger, and Lucius of Cyrene, and Manaen, which had been brought up with Herod the tetrarch, and Saul. As they ministered to the Lord, and fasted, the Holy Ghost said, Separate me Barnabas and Saul for the work whereunto I have called them. And when they had fasted and prayed, and laid their hands on them, they sent them away."
The EGW passage directly quotes and elaborates on Acts 13:1-3, describing the commissioning of Barnabas and Saul. It's a clear and direct reference.