Yahya related to me from Malik from Abu Nuaym Wahb ibn Kaysanthat Jabir ibn Abdullah used to teach them the takbir in the prayer.Abu Nuaym said, "He used to tell us to say 'Allah is greater' wheneverwe lowered or raised ourselves." (IT)
App reference (IT): Book 3, Hadith 22 (IT)
USC-MSA web (English) reference: Book 3, Hadith 22 (IT)
Arabic reference (IT): Book 3, Hadith 169 (IT)