I say, and with God's success: The rule here is that any impurity that exits from the body of a living human nullifies the ablution if it reaches a place that must be washed, either in ablution or in full ritual washing. The meaning here is that an impure substance has exited and reached a place that is subject to the ruling of purification, thus it is considered an event: like that which exits from the private parts; this is because the ruling is on the exit rather than the exiter. Its evidence is what Al-Daraqutni reported in his Sunan from Abu Sa'id Al-Khudri, may Allah be pleased with him, in a raised narration: "If one of you vomits during his prayer or passes gas, let him leave and perform ablution, and let him continue his prayer as long as he does not speak." And what Al-Daraqutni reported in his Sunan from Tamim Al-Dari, may Allah be pleased with him, in a raised narration: "Ablution is required for every flowing blood." This is supported by the hadith in Sahih Bukhari from Aisha, may Allah be pleased with her: "Fatimah bint Abu Hubaysh came to him, peace be upon him, and said: O Messenger of Allah, I am a woman who experiences continuous bleeding and do not become pure, should I abandon prayer? He said: No, that is just a vein and not menstruation, so when menstruation comes, abandon prayer, and when it goes away, wash the blood off you. Hisham ibn Urwah said: My father said: Then perform ablution for every prayer until that time comes." Al-Kasani said in Al-Bada'i 1: 24: "The reports in this regard have reached the level of abundance, to the extent that it was narrated from ten of the companions that they said what is in accordance with our opinion." And see: Al-Mabsut, 1: 76, and Tabyin Al-Haqaiq, 1: 7-8, and Al-Ikhtiyar, 1: 14-15, and Allah knows best.