What is the great verse, that whoever recites it after every prayer, nothing will stand between him and entering Paradise except death?

The verse mentioned is Ayatul Kursi, and it has been reported from the Prophet, peace and blessings be upon him, that "whoever recites Ayatul Kursi after every prayer, nothing will prevent him from entering Paradise except death, and no one perseveres in it but a Siddiq (truthful one) or an 'Abid (worshipper)." Some scholars have graded this hadith as hasan (good), while others have graded it as sahih (authentic).