Ibrahim Nakha'i (may Allah have mercy on him) said: "Separation should be made between the two, and if the woman marries another man, she should complete the waiting period ('iddah) of the first, then begin the 'iddah of the second." Al-Sha'bi (may Allah have mercy on him) said: "She should first observe the 'iddah of the second man, then complete the remaining period of the first 'iddah."