If one performs the fast of Dawud in practice and starts on a Thursday, will one fall into the prohibition of fasting a single day, for example, Saturday?

Question : Is it possible, Shaykh, for you to illustrate the fast of Dawud in practice? For example, if we start on a Thursday, will we end up fasting a single day, for example, Saturday?

Answer : All right. The reason for that is that, as we told you a moment ago, what is prohibited is to single out a day for fasting. However, if there is a reason, such as a person not being able to devote himself to fasting except on Saturday and Friday, or if there is a reason such as having only one day remaining from the month to make up, and only Saturday or Friday is left in the month, or the like.