I say, and with God's success: The remnants (suer) are divided from a legal perspective into four categories: 1) Pure remnants that purify from ritual impurity, 2) Remnants whose use in purification is disliked for the sake of avoidance, 3) Doubtful remnants regarding their purification from ritual impurity but not regarding their purity, and 4) Impure remnants. First: Pure remnants that purify from ritual impurity: Their ruling is like that of pure water, as they remove actual impurity from clothing and the body, and they remove ritual impurity, which is the minor and major impurity. It is permissible to perform ablution and bathing with them. This includes: the remnants of a human if there is no impurity in their mouth, and the remnants of animals whose meat is lawful to eat, such as camels, cattle, and sheep, provided they are not jallalah (i.e., those that eat impurities), and the remnants of horses, as their saliva is derived from their flesh, and their flesh is pure. Second: Remnants whose use in purification is disliked for the sake of avoidance when there are alternatives that are not disliked: It is not disliked when there is no pure water; because it is pure, it is not permissible to resort to dry ablution (tayammum) in its presence. This includes: the remnants of domestic cats, the remnants of free-range chickens (which roam in filth), the remnants of household pests such as mice, snakes, and lizards, and the remnants of predatory birds such as falcons, hawks, and kites. Third: Doubtful remnants regarding their purification from ritual impurity but not regarding their purity: This refers to the remnants of every animal whose meat is disputed regarding its permissibility to eat, such as the domestic donkey and the mule whose mother is a female donkey. It is not ruled as pure or impure concerning ritual impurity; thus, it is doubtful regarding its purification from ritual impurity. If one does not find any other water, they may perform ablution with it and may also perform dry ablution, whichever comes first is permissible. However, it is permissible to remove actual impurity from clothing and the body with it, as it is pure, and the doubt is only regarding its purification from ritual impurity. Fourth: Impure remnants of gross impurity: It is not permissible to purify with them at all, and they may only be consumed in cases of necessity. This includes: the remnants of pigs, the remnants of dogs whether they are hunting dogs or herding dogs, and the remnants of predatory animals such as leopards, wolves, hyenas, tigers, lions, and monkeys; as their saliva is derived from their flesh, which is impure like their milk. Refer to: Maraqi al-Falah 32, al-Sayah 1: 465, and Rad al-Muhtar 1: 149, and Allah knows best.