“Then had the churches rest throughout all Judaea and Galilee and Samaria, and were edified; and walking in the fear of the Lord, and in the comfort of the Holy Ghost, were multiplied.”
King James Version (KJV)
9:31 Then the Church - The whole body of Christian believers, had peace - Their bitterest persecutor being converted. And being built up - In holy, loving faith, continually increasing, and walking in - That is, speaking and acting only from this principle, the fear of God and the comfort of the Holy Ghost - An excellent mixture of inward and outward peace, tempered with filial fear.
Ac 9:31 Then had the churches rest. After the departure of Saul there was a cessation of persecution for several years. The reason is found in the history of the times. The Roman emperor, Caligula, had ordered his statute to be placed in the temple at Jerusalem for worship, a desecration of the temple, and the Jews were too much engaged in their efforts to prevent this to persecute the church. Edified. Built up. Were multiplied. The result, always, of "walking in the fear of the Lord and comfort of the Holy Spirit".