Intending to observe supererogatory Sawm on a particular day

Q 1: With regard to supererogatory Sawm (Fast), one may have the intention to observe Sawm on a particular day but when they get up in the morning, they find themselves in a state of Janabah (major ritual impurity related to sexual discharge). What is the ruling on this matter? Should they complete the Sawm? (Part No. 9; Page No. 177

A: If one observes Sawm at the time when abstention from all that breaks Sawm is due, while they are in a state of Janabah, their Sawm is valid. This ruling is based on the Hadith related by Al-Bukhari and Muslim on the authority of Um Salamah (may Allah be pleased with her) that she said: At times, Allah's Messenger (peace be upon him) used to get up in the morning in the state of Janabah out of sexual relations with his wives, not out of a wet dream. He would not break his Sawm or make up for it later on. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.