A man who marries a woman while having another wife, and is told: Divorce her

Abdullah bin Habib said: I asked al-Hakam (may Allah have mercy on him) and Mujahid (may Allah have mercy on him): If a man has a wife with whom he has consummated the marriage, then he marries another woman, and the first wife says, "I will give you such-and-such compensation on condition that you give me one divorce and also give this woman one divorce," and the man does so, what is the ruling in this case? Al-Hakam (may Allah have mercy on him) said: Both become irrevocably divorced (ba'in).

Mujahid (may Allah have mercy on him) said: The one with whom the marriage was not consummated becomes irrevocably divorced (ba'in), and one divorce falls on the other.

Waki' (may Allah have mercy on him) said: The people follow the view of al-Hakam.