Musnad Ahmad 1019:1

Ibn Abi ‘Adi narrated to us, from Muhammad ibn Ishaq, from Sulayman ibn Suhaym, from his mother, the daughter of Abu al-Hakam al-Ghifari, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Indeed, a man draws near to Paradise until there is nothing between him and it except the length of a cubit, then he speaks a word, and because of it, he is distanced from it further than San‘a."