Did the Prophet, may Allah bless him and grant him peace, say about Marwan ibn al-Hakam, "The gecko, son of the gecko, the accursed, son of the accursed," and what is the ruling on one who declares Yazid ibn Mu'awiyah an infidel?

This Hadith (definition) is fabricated, as Sheikh Al-Albani judged it to be, and it is not permissible to narrate it except to show its fabrication. It is advised to boycott suspicious websites and to suffice with the websites of Ahlus-Sunnah (definition).