And he (Muhammad (Peace be upon him)) withholds not a knowledge of

﴿وَمَا هُوَ عَلَى ٱلۡغَيۡبِ بِضَنِينٖ ﴾
[التَّكوير: 24]

And he (Muhammad (Peace be upon him)) withholds not a knowledge of the unseen

﴿وما هو على الغيب بضنين﴾ [التَّكوير: 24]

Al Bilal Muhammad Et Al
He neither grudgingly withholds knowledge of the unknown

Ali Bakhtiari Nejad
And he is not stingy with the unseen (that is revealed to him)

Ali Quli Qarai
and he is not miserly concerning the Unseen

Ali Unal
He is not niggardly (in conveying to you Revelation and knowledge) of the Unseen (what lies beyond the reach of your perception)

Hamid S Aziz
Nor is he a tenacious concealer of the unseen

John Medows Rodwell
Nor doth he grapple with heaven's secrets

Literal
And he is not on the unseen/supernatural (future) with withholding/clinging

Mir Anees Original
And he is not a miser concealing (information) of the unseen

Mir Aneesuddin
And he is not a miser concealing (information) of the unseen