The one who sees all the hidden matters, all that the hearts keep concealed, the one whose knowledge encompasses everything.
“He is Allah, other than whom none has the right to be worshipped. The King, the Holy, as-Salam, the Giver of Security, the Ever-Watcher, the Almighty, the Compeller, the Supreme. Glory be to Allah! [High is He] above all that they associate as partners with Him.”
[al-Hashr (59): 23]
From “Explanation to the Beautiful and Perfect Names of Allah” — Shaykh as-Sa’di (d.1376H)