«لِأَعْلَقَ مِنْهُ بِمَا يَكُونُ لِي زِينَةً بَيْنَ الْأَنَامِ»
So that I may gain from it something that will adorn me among people.
Li-aʿlaqa uses the lām of purpose, with a subjunctive present verb. In bimā, mā functions as a relative pronoun denoting what the learner hopes to acquire. Yakūnu lī zīnatan contains defective yakūnu and its accusative predicate zīnatan.
The sentence explains both the action of seeking knowledge and the intended social benefit. Reading mā as a simple negation would erase the object of that aspiration; its following clause identifies the desirable quality.