Silsilat al-Ahadith al-Sahihah

Abdur Rahman bin Abu Nu'm says that a man asked Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) about the garment that gets stained with the blood of a mosquito, and I was also sitting there. He (Ibn Umar) said: "Where are you from?" He replied: "From Iraq." Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said: "Look at this man, he asks about the blood of a mosquito? (These people are so oppressive that) they martyred the grandson of the Messenger of Allah (peace and blessings be upon him), and I heard the Messenger of Allah (peace and blessings be upon him) say: 'Indeed, Hasan and Husayn are my fragrant flowers from this world.'"