It is narrated from Sayyiduna Awf bin Malik (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) entered the mosque with a stick in his hand. He (peace and blessings be upon him) saw bunches of dates hanging up, and he poked one of the bunches with the stick, and it turned out to contain poor-quality dates. He (peace and blessings be upon him) said: "Who is the owner of this? If only he had given something better than this in charity. Indeed the owner of this will eat poor-quality dates on the Day of Resurrection." Then he said: "O people of Madinah, you will leave it for forty years to the awafi." It was asked: What are the 'awafi'? He (peace and blessings be upon him) said: "Birds and beasts of prey."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15190
Sayyiduna Awf bin Malik (may Allah be pleased with him) and Ibn Abd Kulal entered the mosque of Hims and saw a gathering. Awf (may Allah be pleased with him) asked: What is this? The people said: Ka'b is preaching. He said: Woe to him! Has he not heard this hadith of the Messenger of Allah (peace and blessings be upon him): "None should preach to the people except a ruler, or one appointed by the ruler, or a vain person."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15191
Sayyiduna Awf bin Malik al-Ashja'i (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever stands to show off, Allah will expose his showing off; and whoever stands to be heard of, Allah will make (his reality) heard by the people."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15192