1. هَذا جَوابٌ غامِضٌ في كِلمَتَي

    شَرطٍ كَإِن وَإِذا مُرادُ تَكَلُّمي

    This is an obscure answer concerning two words

    of condition, such as 'in' ('if') and 'idhā' ('when')—the subject of my discourse.

  2. إِن أَن نَطَقتُ بِها فَإِنّي جازِمٌ

    وَإِذا إِذا تاتي بِها لَم تَجزِمِ

    'In'—if I utter it, I make the verb jussive;

    and 'idhā'—when you use it, you do not make the verb jussive.

  3. فَإِذا لِما جَزَمَ الفَتى بِوُقوعِهِ

    بِخِلافِ إِن فَاِفهَم أَخي وَتَفَهَّمِ

    So 'idhā' is for what the young man is certain will occur,

    unlike 'in'; so understand, my brother, and grasp this fully.