Mosiah 21:24

but when he found that they were not, but that they were his brethren, and had come from the land of Zarahemla, he was filled with exceeding great joy.—

But when he found out they weren’t priests, he learned they were his brothers from the land of Zarahemla. He was filled with great joy.

But when he discovered they weren’t—that they were his own people from the land of Zarahemla—he was overwhelmed with joy.