Part 2 (AYAT-AL-KURSI)

It appears in the Musnad of Ahmad that the Holy Prophet ﷺ has said that this verse is the most meritorious of all. 

According to another Hadith, the Holy Prophet ﷺ asked Sayyidna Ubayy Ibn Ka'b RAA, "Which is the greatest ayah (verse) of the Quran?" Sayyidna Ubayy Ibn Ka'b RAA said, "Ayah al-Kursi." Approvingly, the Holy Prophet ﷺ said, "O Abu al-Mundhir, may Allah bless you in your knowledge."

Sayyidna Abu Dharr RAA asked the Holy Prophet ﷺ, "O Messenger of Allah, which is the greatest ayah (verse) of the Quran?" He said, "Ayah al-Kursi". (Ibn Kathir from Ahmad in Al-Musnad)

From Ma'ariful Quran, by Mufti Muhammad Shafi RE