Sunan al-Shafi'i

Sayyiduna Abu Mas’ud (may Allah be pleased with him), in the explanation of this Divine statement: ﴿وَالْمُحْصَنَاتُ مِنَ النِّسَاءِ إِلَّا مَا مَلَكَتْ أَيْمَانُكُمْ﴾ [سورة النساء : 24] “And (forbidden to you are) married women except those whom your right hands possess,” says that these women were married, their husbands were present before they were taken captive in war, but when they became slave women, then (after ensuring they are not pregnant) it is lawful for Muslims to marry or have intercourse with them.