How is it reconciled that the best fasting is the fasting of Dawud, given the dislike of fasting on Saturday alone and Friday alone?

The questioner : He saysThe questioner : How is the fasting of the Prophet Dawud (peace be upon him) reconciled with the dislike of fasting on Saturday alone and Friday alone? It appears he wants to ask about the hadith of the Prophet (peace and blessings be upon him): , and if I want to apply this hadith, the fasting of Dawud?

The Shaykh : I understand his question. This question is equivalent to if someone asked: How is the encouragement of the fasting of Dawud (peace be upon him) reconciled with the prohibition of fasting on the day of the festival? This hadith is agreed upon by al-Bukhari and Muslim. However, this is a general hadith, and this issue also relates to the principles of jurisprudence. When a general text indicates the permissibility of many things, or the recommendation of many things, and then a specific hadith comes that contradicts the permissibility or recommendation, the specific is excluded from the general. So, the best fasting is the fasting of Dawud (peace be upon him) is a text that includes all days: Friday alone, Saturday alone, and the day of the festival alone. What is the position of the jurist?
The jurist excludes from the general text the specific items that the Lawgiver has prohibited. He excludes these specific items from the general text. So we say: The best fasting is the fasting of Dawud (peace be upon him), except if it happens that one of these days is a day of the festival. In that case, that day is not fasted, because the prohibition regarding it has come. Likewise, we say: The best fasting is the fasting of Dawud (peace be upon him), except if it happens that one of those days is a Friday. In that case, it is not fasted, because the prohibition of fasting it alone has come. Likewise, in the final analysis, we say: The best fasting is the fasting of Dawud (peace be upon him), except if it happens that one of those days is a Saturday. Because the Prophet (peace and blessings be upon him) prohibited that in a hadith whose authenticity is well known: (the bark of a tree). So he emphasizes breaking his fast on Saturday.