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Acquiring knowledge only for worldly gain or concealing knowledge

Those who conceal the clear proofs and the guidance, after We have made it clear in the Book for mankind, will have Allah’s curse and that of those who are entitled to curse; 2:159

Meaning:-
Conceal: to hide, to keep secret, to prevent or avoid disclosing, keep secret.

He who is asked about knowledge he knows and does not reveal it, will be sewed with fire at the Day of Judgement. He who learns for secular purposes or not for Allah’s sake, would settle down on his place in Hell