Ibn Abee Shaybah 1/114: Know the VASTNESS: Our UNIVERSE and the 6 more above it, in comparison to the size of Allah’s Kursee, is a RING in a desert.

Prophet Muhammad (sallallahu ‘alayhi wa sallam) said:

“The seven Heavens compared to the Kursee (the footstool) is like a ring which is thrown into a desert.

And such is the magnitude of the ‘Arsh (the Throne of Allah) compared with the Kursee.”

Saheeh: Related by Ibn Abee Shaybah in Kitaabul-‘Arsh (1/114)
and al-Bayhaqee in as-Asmaa was-Sifaat (p.290), from Abu Dharr (radiAllahu ‘anhu).

The hadeeth is authentic due to its various routes of transmission-as Shaykh al-Albaanee has explained in as-Saheeh (no.109).