Completing the ablution on the disliked things and its obligation

Question:
He says: In the hadith regarding the abridgment of the highest assembly, and among the reports concerning the causes of the manifestation of the disbeliever's knowledge, does not this hadith indicate that the causes are among the secrets of manifestation?

Answer:
As for applying it to the hardships, meaning his patience with the hardships, this entails an increase in reward, just as if the weather is cold or the water is cold and he is patient with that and performs wudu', he is given an increase in reward. As for the original application, it is obligatory, as evidenced by what we mentioned to you: the saying of the Messenger (peace and blessings be upon him), "Woe to the heels and the soles of the feet from the Fire."
His saying, and that the Messenger (peace and blessings be upon him) ordered the one who sees in his wudu'... this is in the hadith itself. The book of al-Balut... this hadith will come: that he ordered the one who sees a spot in it that the water did not reach to perfect his wudu', to go back and perfect his wudu'. Yes.