Al-Mubeen is the one who is manifest and clear in His existence, His oneness, and His perfect attributes. His proofs and evidences are clear, His religion is clear, and His judgement is clear. He makes the truth manifest and distinguishes it from falsehood. On the Day of Judgement, He will pay every soul its just recompense, and they will know that Allah — He is the Clear Truth.
“On that Day, Allah will pay them their just due, and they will know that Allah — He is the Clear Truth (al-Haqq al-Mubeen).”
[an-Nur (24): 25]
“Alif Lam Ra. These are the verses of the Clear Book (al-Kitab al-Mubeen).”
[Yusuf (12): 1]
From “Explanation to the Beautiful and Perfect Names of Allah” — Shaykh as-Sa’di (d.1376H)