God, the Exalted said: “He is the First (nothing is before Him), and the Last (nothing is after Him), the Most High (nothing is above Him) and the Most Near (nothing is nearer than Him)”. (Al-Hadid: 3)
P.B.U.H. said: “… And You Are the Manifest, for nothing is higher than You, and You are the Hidden, for nothing is below You.”
The Linguistic Meaning:
It is the opposite of clear, as it indicates hidenness and concealment.
He is the Hidden, Near to everything, knowing about all hidden things, including the conscience. He conceals the nature of His Essence and His Attributes, the All-Mighty.
The Grandeur of Al-Awwall, Al-Akher, Ad-Hdhaher and Al-Batten
These Sublime Names include the bases of monotheism and knowledge: For He is the First in eternity and the Last in His Beginning, the Manifest in His Concealment and the Hidden in His Clearness. He is always the First, the Last, the Manifest and the Hidden; therefore the slave should know these Names as much as he can comprehend. Worshipping Him by Al-Batten, means that the Lord is close to the slave more than anything else.