ath-Thaahir (The Knower of All Apparent Things)
“And He is the First, the Last, ath-Thaahir, the Knower of all hidden things.”
Sooratul-Hadeed [57:3]
Reference:
Exemplary principles concerning the beautiful names of Allaah.
Shaykh Muhammad Ibn Saalih Al-‘Uthaymeen D. 1421 H
Translated by Moosaa Richardson
Revised 2nd Edition with additional commentary.