New Revised Standard Version
David also married Ahinoam of Jezreel; both of them became his wives.

Contemporary English Version
David had earlier married Ahinoam from the town of Jezreel, so both she and Abigail were now David's wives.

New American Bible
David also married Ahinoam of Jezreel. Thus both of them were his wives.

Douay-Rheims Bible
Moreover David took also Achinoam of Jezrahel: and they were both of them his wives.

Moreover David took also Achinoam of Jezrahel: and they were both of them his wives.

Jezreel

Joshua 15:56 Jezrael and Jucadam and Zanoe,

2 Samuel 3:2 And sons were born to David in Hebron: and his firstborn was Ammon of Achinoam the Jezrahelitess:

both

Genesis 2:24 Wherefore a man shall leave father and mother, and shall cleave to his wife: and they shall be two in one flesh.

Matthew 19:5,8 For this cause shall a man leave father and mother, and shall cleave to his wife, and they two shall be in one flesh. . . .

his wives

1 Samuel 27:3 And David dwelt with Achis at Geth, he and his men; every man with his household, and David with his two wives, Achinoam, the Jezrahelitess, and Abigail, the wife of Nabal of Carmel.

1 Samuel 30:5 For the two wives also of David were taken captives, Achinoam, the Jezrahelitess, and Abigail, the wife of Nabal of Carmel.

2 Samuel 5:13-16 And David took more concubines and wives of Jerusalem, after he was come from Hebron: and there were born to David other sons also and daughters: . . .