Marwan bin al-Hakam related that when Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) was stabbed, he said: I hold an opinion concerning the grandfather; if you see fit to follow it, then do follow it. Sayyiduna Uthman (may Allah be pleased with him) said: If we follow your opinion, it is sound; and if we follow the opinion of the Shaykh before you, he was a man of excellent opinion.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12421