Several poems could fit the theme of "farewell" (فراق), depending on the specific tone and style you[SQ]d like. Here are a few options, each with a different feel :

Option 1: A melancholic farewell

يا أيها القمرُ المنيرُ البعيدُ
يا من رحلتَ وخلّفتَ القلبَ حزينًا
أينَ تلكَ الأيامُ الجميلةُ السعيدَةُ
أينَ ضحكاتُنا والذكرياتُ القديمةُ؟

يا رحيلَكَ الذي مزّقَ روحي شَقًّا
يا فراقهُ الذي ملأَ قلبي بِحُزْنٍ عميقًا
سأفتقدُكَ دائمًا، يا من كنتَ لي كل شيءٍ
ولن أنسى حبّكَ، مهما طالَ الزمنُ الطويلُ


*(Translation: O shining, distant moon, / You left and left my heart sorrowful. / Where are those beautiful, happy days? / Where are our laughter and old memories? / Your departure tore my soul apart, / Your absence filled my heart with deep sadness. / I will always miss you, you who were everything to me, / And I will never forget your love, no matter how long the time.)*

Option 2: A hopeful farewell

إنّ الفراقَ ليسَ نهايةَ الطريقِ
بل هوَ بدايةُ رحلةٍ جديدةٍ
سأبقى أذكُرُكَ دائمًا، يا صديقي الحبيبُ
وَسأحملُ ذكرياتِنا الجميلةَ في قلبي


*(Translation: Farewell is not the end of the road, / But the beginning of a new journey. / I will always remember you, my dear friend, / And I will carry our beautiful memories in my heart.)*

Option 3: A brief, poignant farewell

وداعًا يا حبيبي، دموعي تنهمرُ
فراقُكَ أشدُّ منَ السيفِ قاطعُ


*(Translation: Farewell, my beloved, my tears are falling. / Your absence is sharper than a cutting sword.)*


These are just examples, and the best poem for you will depend on your specific needs and the context of the farewell. You can adjust the imagery and tone to better suit your desired effect. Consider what aspects of the farewell you want to emphasize: the pain, the hope, the memories, etc.