A man from Iraq worried whether killing a mosquito requires a sacrifice during Hajj while al-Ḥusayn had just been killed at Karbalāʾ
I was present when a man asked Ibn ʿUmar about the blood of mosquitoes. Ibn ʿUmar said, "From where are you?" The man replied. "From Iraq." Ibn ʿUmar said, "Look at that! he is asking me about the blood of Mosquitoes while they (the Iraqis ) have killed the (grand) son of the Prophet. I have heard the Prophet ﷺ saying, "They (Hasan and Husain) are my two sweet-smelling flowers in this world."
كُنْتُ شَاهِدًا لاِبْنِ عُمَرَ وَسَأَلَهُ رَجُلٌ عَنْ دَمِ الْبَعُوضِ فَقَالَ مِمَّنْ أَنْتَ فَقَالَ مِنْ أَهْلِ الْعِرَاقِ قَالَ انْظُرُوا إِلَى هَذَا يَسْأَلُنِي عَنْ دَمِ الْبَعُوضِ وَقَدْ قَتَلُوا ابْنَ النَّبِيِّ ﷺ وَسَمِعْتُ النَّبِيَّ ﷺ يَقُولُ هُمَا رَيْحَانَتَاىَ مِنَ الدُّنْيَا