What is the benefit of the Prophet's (peace and blessings be upon him) saying, "Which of you did not have intercourse tonight?"
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Question : May Allah reward you, O Shaykh. What is the benefit of the Prophet's (peace and blessings be upon him) saying, "Which of you did not have intercourse tonight?"
Answer : Yes, the benefit is that "did not have intercourse" means did not have sexual relations. He did not have relations with her. The scholars (may Allah have mercy on them) discussed the reason: why did he say it? Was it because Uthman (may Allah be pleased with him) had just married, and he had intercourse that night, and he feared that he would be buried with her, so he said, "Which of you did not have intercourse tonight?" Or perhaps we do not know? Allah knows best.
Answer : Yes, the benefit is that "did not have intercourse" means did not have sexual relations. He did not have relations with her. The scholars (may Allah have mercy on them) discussed the reason: why did he say it? Was it because Uthman (may Allah be pleased with him) had just married, and he had intercourse that night, and he feared that he would be buried with her, so he said, "Which of you did not have intercourse tonight?" Or perhaps we do not know? Allah knows best.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 1208 - 4600 ما فائدة قول النبي صلى الله عليه وسلم أيكم لم يقارف الليلة؟ ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.