It is narrated from Sayyiduna Ali (may Allah be pleased with him) that he said: "Four men took charge of all the arrangements for the burial of the Messenger of Allah (peace and blessings be upon him) and for keeping it hidden from the general public: Ali, al-Abbas, al-Fadl and Salih (may Allah be pleased with them). A lahd (niche grave) was prepared for him (peace and blessings be upon him), and unbaked bricks were set upright over it in proper order."
Imam Musaddad bin Musarhad transmitted this report in his Musnad, and it is mursal (with a missing link) because Sa'id bin al-Musayyib did not hear from Sayyiduna Ali (may Allah be pleased with him).
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب السيرة والمغازي / 4325
Hadith Gradingمحدثین:إسناده مرسل
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :مرسل. » «أخرجه مصنف ابن أبي شيبة برقم: 9»