question #3 Sahih al-Bukhari 6057, Book 78, Hadith 87 : Why is it important to maintain moral conduct while observing fasts in Islam?

The Prophet (ﷺ) said, “Whoever does not give up false statements (i.e. telling lies), and evil deeds, and
speaking bad words to others, Allah is not in need of his (fasting) leaving his food and drink.”