What is Ibn Uthaymeen's view on the Hadith of Aisha, may Allah be pleased with her, concerning the yellowish discharge, and is the addition "after purification" in the Hadith "We did not consider the yellowish and brownish discharge as anything" weak, and have the scholars unanimously agreed that purity is achieved by dryness?

Summary of Sheikh Ibn Uthaymeen's fatwa: The yellowish and brownish discharges are not considered menstruation except for what is connected to the blood during its flow. As for what precedes the blood or comes after its cessation, it is not given any consideration. The Sheikh cited Umm Atiyah's hadith, "We did not count the yellowish and brownish discharges after purification as anything." He holds that menstruation is blood, and purification is achieved by the cessation of blood. As for the majority of scholars, they believe that the yellowish and brownish discharges connected to menstruation or occurring after the cessation of blood are considered menstruation as long as they are within the days of possibility. Regarding the sign of purity, the standard for most jurists is dryness, except for what is narrated from Malik concerning those who see the white discharge.