What is meant by fasting in the saying of Allah the Exalted: “Indeed, I have vowed to the Most Merciful a fast”?
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The questioner : So she vowed to the Most Merciful a fast that was not a burden on that day. What is meant by this voice?
The Shaykh : Fasting means abstaining from speech. It is permissible for a person to walk freely. She did not say it that way, but you are not exempt from obligatory speech. And abstain from forbidden speech. And it is better to abstain from idle speech, for speech is of three categories for us: obligatory, forbidden, and idle. The obligatory is what we must speak.
The questioner : If you asked someone from the university. The university, I am fasting for you.
The Shaykh : That is permissible, permissible, but it is not permissible to call it a climb.
The Shaykh : Fasting means abstaining from speech. It is permissible for a person to walk freely. She did not say it that way, but you are not exempt from obligatory speech. And abstain from forbidden speech. And it is better to abstain from idle speech, for speech is of three categories for us: obligatory, forbidden, and idle. The obligatory is what we must speak.
The questioner : If you asked someone from the university. The university, I am fasting for you.
The Shaykh : That is permissible, permissible, but it is not permissible to call it a climb.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، [821] ما المقصود بالصوم في قوله تعالى: ﴿إِنِّي نَذَرْتُ لِلرَّحْمَنِ صَوْمًا﴾؟ - ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.