Berean Study Bible
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.

King James Bible
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.

American Standard Version
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.

Darby Bible Translation
They stayed therefore a good while, speaking boldly, [confiding] in the Lord, who gave witness to the word of his grace, giving signs and wonders to be done by their hands.

Douay-Rheims Bible
A long time therefore they abode there, dealing confidently in the Lord, who gave testimony to the word of his grace, granting signs and wonders to be done by their hands.

English Revised Version
Long time therefore they tarried there speaking boldly in the Lord, which bare witness unto the word of his grace, granting signs and wonders to be done by their hands.

Young's Literal Translation
long time, indeed, therefore, did they abide speaking boldly in the Lord, who is testifying to the word of His grace, and granting signs and wonders to come to pass through their hands.