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."
App reference: Book 3, Hadith 22
USC-MSA web (English) reference: Book 3, Hadith 22
Arabic reference: Book 3, Hadith 169