So Paul and Barnabas spent considerable time there, speaking boldly for the Lord, who affirmed the message of His grace by enabling them to perform signs and wonders.
KJV
Long time therefore abode they speaking boldly in the Lord, which gave testimony unto the word of his grace, and granted signs and wonders to be done by their hands.
ASV
Long time therefore they tarried there speaking boldly in the Lord, who bare witness unto the word of his grace, granting signs and wonders to be done by their hands.