It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that he used to come every Thursday and, standing (without sitting down), he would say: "Do not wear people out to death (with your long talks), for among them are the old, the weak and the needy." Then he would say: "In reality there are only two things: the best guidance is the guidance of Muhammad (peace and blessings be upon him), and the most truthful speech is the Book of Allah. The worst of matters are the newly invented matters in the religion, and every newly invented matter is misguidance. Beware! The wretched one is he who was written down as wretched while still in his mother's womb, and the fortunate one is he who takes admonition from the fate of others. Beware! Let not the term grow long for you, and let not hopes make you heedless, for whatever is coming is near; far is only that which is not coming at all. Among the worst of people is one who idles about uselessly by day and lies asleep like a carcass by night. Killing a believer is disbelief, reviling him is sinfulness, and it is not lawful for a Muslim to cut off his brother for more than three days. Beware! The worst of mounts are the mounts of lying, and lying is not proper, whether in earnest or in jest, nor is it proper for a man to make a promise to his child and then not fulfil it. Beware! Lying leads to wickedness and wickedness leads to Hell, and truthfulness leads to righteousness and righteousness leads to Paradise. It is said of the truthful person: He spoke the truth and acted righteously; and it is said of the liar: He lied and acted wickedly. And I heard the Messenger of Allah (peace and blessings be upon him) say:" "A servant keeps speaking the truth until he is written down with Allah as a siddiq (truthful one), and he keeps lying until he is written down with Allah as a liar." Then (Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him)) said: "Beware! Do you know what al-'adh is? It is carrying words from one side to the other, that is, the tale-bearing that spreads corruption among people."
Hadith Referenceالمعجم الأوسط / باب الميم / 7871
Hadith Takhrij«أخرجه البخاري فى «صحيحه» برقم: 48، 6044، 7076، ومسلم فى «صحيحه» برقم: 64، وابن حبان فى «صحيحه» برقم: 5939، والنسائي فى «المجتبى» برقم: 4116 / 2، 4118 / 4، 4117 / 3، 4121 / 7، 4119 / 5، 4120 / 6، 4122 / 8، 4123 / 9، 4124 / 10، والنسائي فى «السنن الكبرى» برقم: 3557، 3558، 3555، 3556، 3559، 3560، 3563، 3564، 3561، 3562، 3565، والترمذي فى «جامعه» برقم: 1983، 2634، 2635، وابن ماجه فى «سننه» برقم: 46، 69، 3939، والبيهقي فى «السنن الكبرى» برقم: 15953، 15952، 20969، وأحمد فى «مسنده» برقم: 3721، 3980، 4036، 4208، 4263، 4348، 4431، 4480، والطيالسي فى «مسنده» برقم: 245، 256، 304، والحميدي فى «مسنده» برقم: 104، وأبو يعلى فى «مسنده» برقم: 4988، 4991، 5119، 5276، 5332، 5346، والبزار فى «مسنده» برقم: 1660، 1795، 2021، 2076، وابن حجر فى «المطالب العالية» برقم: 3125 / 1، وابن أبي شيبة فى «مصنفه» برقم: 13407، 13408، 35694، والطحاوي فى «شرح مشكل الآثار» برقم: 848، 849، 846، 847، 850، والطبراني فى «الكبير» برقم: 8522، 8532، 10105، 10308، 10316، 10380، والطبراني فى «الأوسط» برقم: 3567»