Musnad Abu Ya'la al-Mawsili 65:6

Al-Qawariri narrated to us, Abd al-Rahman narrated to us, from Sufyan, from Salamah ibn Kuhayl, who said: I heard Jundub al-Bajali say: The Messenger of Allah (ﷺ) said: "Whoever lets people hear [of his good deeds to show off], Allah will let [the people] hear [of his hypocrisy]. And whoever shows off, Allah will show off [his hypocrisy]."