An-Nisa 4:22

Wala tankihoo ma nakahaabaokum mina annisa-i illa maqad salafa innahu kana fahishatan wamaqtan wasaasabeela

And do not marry those [women] whom your fathers married, except what has already occurred. Indeed, it was an immorality and hateful [to Allāh] and was evil as a way.

Do not marry those women whom your fathers had married except what has passed. It is indeed shameful and detestable, and it is an evil practice.