Benefit: Recitation of Āyat al-Kursī at the End of Every Prescribed Prayer
In the Name of Allāh, the Ever Merciful, the Bestower of Mercy
Imām al-Nisāʾī, may Allāh have mercy upon him, mentioned in his book, 'Amalul-Yawm wal-Laylah, on the authority of Abū Umaamah, radhiyullāhu ʿʿʿanhu, that the Messenger of Allāh, ṣallallāhu ʿalayhi wa-sallam said, "Whoever reads Āyat al-kursī (2:255) at the end of every prescribed prayer (ie. five daily prayers), nothing will prevent him from entering Jannah except death."
Authenticated by Shaykh al-Albaani, Silsilah al-Aḥādīth al-Ṣaḥihah #972 and Shaykh Muqbil declared it ḥasan (sound).