Ether 1:40–41 and 6:20 in the 1830 edition of the Book of Mormon.
Joseph Smith, Jr., The Book of Mormon: An Account Written by the Hand of Mormon, Upon Plates taken from the Plates of Nephi (Palmyra, NY: E. B. Grandin, 1830), 540, 549
And it came to pass that the Lord did hear the brother of Jared, and had compassion upon him, and said unto him, Go to and gather together thy flocks, both male and female, of every kind; and also of the seed of the earth of every kind, and thy families; and also Jared thy brother and his family; and also thy friends and their families, and the friends of Jared and their families.
. . .
And it came to pass that they went forth upon the face of the land, and began to till the earth. And Jared had four sons; and they were called Jacom, and Gilgah, and Mahah, and Orihah. And the brother of Jared also begat sons and daughters. And the friends of Jared and his brother, were in number about twenty and two souls; and they also begat sons and daughters, before they came to the promised land