Helaman 5:18

And it came to pass that Nephi and Lehi did preach unto the Lamanites with such great power and authority: for they had power and authority given unto them that they might speak; and they also had what they should speak, given unto them;

Nephi and Lehi preached to the Lamanites with great power. They had power given to them so they could speak. They were also given what to say.

Nephi and Lehi preached to the Lamanites with tremendous power and authority. They’d been given the power and authority to speak, and they’d been given the very words to say.