Many solitary reports convey knowledge and certainty:

Everything that has been said so far in examining and proving the invalidity of the aforementioned distinction rested on the assumption that a solitary report provides nothing beyond a strong probability and does not yield definitive, certain knowledge. One must realize that this assumption cannot be accepted without qualification; the issue is more nuanced, as discussed in its proper place. What matters to us here is that a solitary report often does provide knowledge and certainty. This includes the hadiths that the ummah has universally received with acceptance—as well as those recorded by al-Bukhari and Muslim in their Sahihs for which no criticism has been raised. Such hadiths are unequivocally authentic, and they furnish theoretical, indubitable knowledge, as Imam Ibn al-Ṣalah definitively stated in his ‘Ulum al-Hadith (pp. 28–29). Al-Hafiz Ibn Kathir upheld the same view in his abridgement, and before them Shaykh al-Islam Ibn Taymiyyah, followed by the scholar Ibn Qayyim al-Jawziyyah in his Mukhtasar al-Ṣawa‘iq (2/383). They illustrated this with several hadiths, among them the hadith of ‘Umar—may Allah be pleased with him—“Actions are judged only by intentions,” the hadith, “When he sits between her four limbs and exerts himself, a ritual bath becomes obligatory,” and the hadith