Brigham Young's diary states: "Monday evening Baptized Sisters Cuoub [Auga Adams Cobb] & Hari[e]tt Cook." Two days later Joseph Smith marries these two women to Young. Auga Adams Cobb married Henry Cobb of Boston, Mass., in 1822. She left him five of her seven children to join with the Mormons. Her husband divorced her in 1847- four years after she married Brigham Young.
He baptized Sister Cobb and Harriet Cook, possibly in preparation for his plural marriage to them two days later.
[Quinn, D. Michael, "The Practice of Rebaptism at Nauvoo," BYU Studies (1978), 18:2:226]