Musnad Ahmad 1121:0

Narrated to us by Abdullah, who said: Narrated to me my father, who said: Narrated to us by Waki’, from Sufyan, from Abu Ishaq, from Jabalah ibn Harithah al-Kalbi, who said: I came to the Prophet (peace and blessings of Allah be upon him) and said: "O Messenger of Allah, teach me something that I may do, and by which Allah may benefit me." He said: "Adhere to truthfulness, for truthfulness leads to righteousness, and righteousness leads to Paradise. And beware of lying, for lying leads to wickedness, and wickedness leads to the Fire."