IKR? What's the penalty in Islam for adultery?
"The woman and the man guilty of zināʾ (for fornication or adultery),- flog each of them with a hundred stripes: Let not compassion move you in their case, in a matter prescribed by Allah, if ye believe in Allah and the Last Day: and let a party of the Believers witness their punishment."
— Qur'an, Sura 24 (An-Nur), ayat 2[24]