ما الفرق في الاستخدام والأفصح بين "بينا" و"بينما"؟

The words (bainā) and (bainamā) have the same meaning, which is "from time to time" or "at times." Their origin is the adverbial (bain), which denotes "middle" in relation to time and place. The fatḥa on the letter nūn in (bainā) was lengthened to an alif, and (mā) was added to (bainamā) to prevent it from being annexed to a singular noun. Both terms are eloquent in the Arabic language and have appeared in hadiths in the Two Sahihs.