Musannaf Ibn Abi Shayba 3:1279

Marwan ibn Mu'awiyah narrated to us, from Ayyub ibn Najih, who said: I was with Sa'id ibn Jubayr. We stood for the Maghrib prayer, and we had missed one rak'ah. When Sa'id stood to complete [the prayer], he recited: "Alhakumu-t-takathur" (The mutual rivalry for piling up [worldly things] diverts you).