It is narrated from Sayyiduna Hudhayfah (may Allah be pleased with him) that we went with the Prophet (peace and blessings be upon him) towards Tabuk. He (peace and blessings be upon him) dismounted from his mount so that revelation could come to him. The she-camel got up and tried to run off, so Sayyiduna Hudhayfah (may Allah be pleased with him) took hold of her reins and sat beside her. When the Prophet (peace and blessings be upon him) stood up, he came towards the she-camel and asked: "Who is this?" He said: Hudhayfah bin al-Yaman. The Prophet (peace and blessings be upon him) said: "I will tell you a secret; do not tell anyone: I have been forbidden from praying (the funeral prayer) over so-and-so and so-and-so." Then, when the Prophet (peace and blessings be upon him) passed away and Sayyiduna Umar (may Allah be pleased with him) became caliph, Sayyiduna Umar (may Allah be pleased with him) would keep Sayyiduna Hudhayfah (may Allah be pleased with him) with him, and whoever's (funeral) Sayyiduna Hudhayfah (may Allah be pleased with him) declined, Sayyiduna Umar (may Allah be pleased with him) would not pray over him.
This is mursal; it has also been narrated as connected (mawsul) through another route.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المرتد / 16844