It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "The scholars of this Ummah are of two kinds. One is a man to whom Allah gave knowledge and he gave it out to people, without seeking any gain (greed) for it and without selling it for a price; such a man is the one for whom the fish of the sea, the beasts of the land and the birds in the expanse of the sky seek forgiveness, and he will come before Allah as an honoured leader until he gains the company of the Messengers. The other is a man to whom Allah gave knowledge but he was miserly with it towards the servants of Allah, sought gain (greed) for it and sold it for a price; he will be bridled with a bridle of fire on the Day of Resurrection, and a caller will call out: This is the one to whom Allah gave knowledge but he was miserly with it towards the servants of Allah, sought gain for it and sold it for a price. He will be dealt with in this way until the reckoning is finished."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-Awwam except Abdullah bin Khirash, and it is not narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) except with this chain."
Hadith Referenceالمعجم الأوسط / باب الميم / 7187
Hadith Takhrij«أخرجه النسائي فى «السنن الكبرى» برقم: 8030، 8031، والترمذي فى «جامعه» برقم: 2950، 2951، والدارمي فى «مسنده» برقم: 238، وأحمد فى «مسنده» برقم: 2098، 2468، 2719، 3022، 3082، وأبو يعلى فى «مسنده» برقم: 2338، 2585، 2721، والبزار فى «مسنده» برقم: 4757، 4758، 5084، وابن حجر فى «المطالب العالية» برقم: 3048، وابن أبي شيبة فى «مصنفه» برقم: 26777، 30725، والطحاوي فى «شرح مشكل الآثار» برقم: 393، 392، والطبراني فى «الكبير» برقم: 10845، 11310، 12393، 12394، 12392»