Surah An-Nisa' 4:22

ﱠ ﱡ ﱢ ﱣ ﱤ ﱥ ﱦ ﱧ ﱨ ﱩ ﱪ ﱫ ﱬ ﱭ ﱮ ﱯ ﱰ ﱱ

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