The Messenger (sal Allahu alaihi wa sallam) said :

“Whoever recites Ayat Al-Kursiy after each obligatory prayer, then nothing stands in his way to Paradise except death.”

This hadeeth is reported by At-Tabaraani, ibn as-Sunni, ibn Hibbaan, and others. Ibn Hibbaan graded it as saheeh in his book As-Salaat. Al-Haythami said: “At-Tabaraani reported it in Al-Kabeer and Al-Awsat with different narrations, one of them is good.” Al-Haafith ibn Hajar said,“Its isnaad is saheeh…and ibnul Jawzee was inattentive when he reported it in his Mawdoo’aat (fabricated collection of ahaadeeth).” Shaykh al-Albaani authenticated it in As-Silsilah As-Saheehah (vol.2, no.972) and said: “Ibn Khatheer declared it as saheeh in his tafseer (exegesis).” He noted that Shaykh-ul-Islaam ibn Taymeeyah’s calssification of this hadeeth as weak, as in his Fatawaa (22:508), “Appears to be made at the stage when he was beginning to seek knowledge. In fact, his student Imaam ibnul Qayyim related that he (ibn Taymeeyah ) was reported to have said, “I never relinquished [to recite] it after each [obligatory] salaat.” After detailing the various reports regarding this hadeeth, ibnul Qayyim commented, “It has its basis and it is not mawdoo’ (fabricated).” [See ibnul Qayyim’s Zaadul Ma’aad (Beirut, Lebanon: Mu’assasatur-Risaalah (Checked by Shu’ayeb and ‘Abdul Qaadir al-Arna’oot), 2d, ed. 1418/1997)], pp. 293-294.  …from : AayatulQursi – Uthaimeen – From Commentary on Imaam ibn Taymeeyah’s Sharhul ’Aqeedatil-Waasitiyyah

Further Reading :

• [Video] Ayat-ul-Kursi (2: 255) with transliteration, english translation & Hadeeth
• Tafseer Ayatul-Kursi – by Shaykh Muhammad Saleh Al Uthaymeen
• The Hadeeth of the Ghoul ( Hadeeth of Ayatul Qursi)