"Muttafaqun ’alayhi" (متفق عليه) in ḥadīth terms refers to a ḥadīth reported by both Bukhāri and Muslim in their Sahih compilations respectively from the same C

Most of us are familiar with this usage because it is the same usage adopted by most of the scholars. But did you know that Abul Barakāt Al-Majd ibn Taymiyyah (the grandfather of Sheikhul Islam ibn Taymiyyah) adopted his own usage of this term in his "Muntaqā"?! So when he writes (متفق عليه), he actually means the ḥadīth is reported by Bukhari, Muslim & Imam Ahmad! That's why scholars encourage us to begin with the introduction, in order to understand the author's terminologies and methodology. This PDF shared here has taken (متفق عليه) to another level. The author compiles all ḥadīths agreed upon between the four famous Sunan compilations which are not collected in the Saheehayh. He also clarifies the authenticity and offers a brief explanation for each ḥadīth. 150 ḥadīths in total, of which 141 are authentic.