It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), and this hadith reaches the Prophet (peace and blessings be upon him), that he (peace and blessings be upon him) used to give a sermon standing on Thursday, saying: "O people, it is only a matter of two things: guidance and speech." Then the narrator mentioned (the rest) similar to the hadith of Ma'mar from Abu Ishaq.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8488