Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "The key to prayer is ablution; what makes things forbidden in it is the takbir; and what makes them lawful is the salam."
Abu Umar al-Darir is alone in narrating it in this way, according to what Ibn Sa'id and many of the hadith masters claimed; however, Habban bin Hilal corroborated him in it from Hassan, so it is Hassan who is alone in narrating it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3971
Hadith Gradingمحدثین:حسن
Hadith Takhrij«حسن۔ رواه ابن ابي شيبة في للصنف 2307»