a sutrah. But the correct view is that it is recommended in all cases, whether one fears that someone may pass in front of him or not.
It is understood from his words that it is not obligatory, and that if a person prays without a sutrah, he is not sinful. This is the view held by the majority of scholars (2), because it is among the matters that complete the prayer; the validity of the prayer does not depend on it. Nor is it part of the prayer itself or of its essential nature such that its absence could be said to invalidate it. Rather, it is something intended to perfect the prayer, and therefore it is not obligatory. This is the contextual indication that shifts the command to use it from obligation to recommendation.
The majority cited the following evidence:
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The hadith of Abu Sa'id al-Khudri: “When one of you prays facing something that screens him from the people, and someone wishes to pass in front of him, let him prevent him.” (3) The words, “When one of you prays facing something that screens him,” indicate that a worshipper may pray facing something that screens him, or he may not pray facing one. For wording of this kind does not indicate that all people pray facing a sutrah; rather, it indicates that some pray facing a sutrah, while others do not.
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The hadith of Ibn Abbas: “He came to Mina while the Prophet ﷺ was leading his Companions in prayer there, without a wall in front of him.” (4)