in a state of major impurity (junub)? He replied, “Yes, provided he performs ablution.” ⦗al-Bukhari 285; Muslim 306⦘.
'Ammar ibn Yasir likewise reported that “the Prophet ﷺ granted a concession to the one who is junub: if he wishes to eat, drink, or sleep, he may perform the same ablution he makes for prayer.” ⦗Ahmad 18407; al-Tirmidhi 613 – declared authentic⦘.
The present hadith therefore shows that it is recommended to perform ablution before a second act of intercourse.
Scholarly disagreement
The jurists have differed over whether a person in janābah may sleep without ablution:
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The Ẓāhirī school holds it to be forbidden, relying on the reports of Ibn ‘Umar, ‘Ammar, and others of similar wording.
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In the well-known position of his school, Imam Ahmad considers ablution recommended and its omission disliked, because ablution lightens the gravity of janābah and eases its burden on the sleeper, who should lie down in a state of complete purity. This is supported by the hadith of al-Barrāʾ, recorded by al-Tirmidhi 3589 and others, in which the Prophet ﷺ said: “When you go to bed, perform ablution as you do for prayer.”
Shaykh al-Islam (Ibn Taymiyyah) said: “Ablution before every sleep is recommended for everyone.”
Al-Zurqani noted that the majority of the Companions and Successors deemed it permissible to forgo ablution altogether, without even deeming it disliked, and this is likewise the position of the jurists of the major centers.
The strongest view, however, is that of Imam Ahmad: ablution before sleep is recommended and omitting it is disliked, for this is the least that can be concluded from the many authentic and explicit hadiths on the subject.