Question: Will one who eats what is forbidden not enter Paradise?
Answer: The Prophet ﷺ said:
«لا يدخل الجنة لحم نبت من السحت وكل لحم نبت من السحت كانت النار اولٰي به»
Reference: Ahmad 321/3, Mustadrak al-Hakim 422/4
Imam al-Hakim and Imam al-Dhahabi (may Allah have mercy on them) declared this hadith sahih (authentic). Likewise, Imam Ibn Hibban (may Allah have mercy on him) also called it sahih.
Reference: Mawarid al-Zam’an p. 378
“The flesh that has grown from what is forbidden will not enter Paradise, and for any flesh that has grown from what is forbidden, the Fire of Hell is more fitting.”