Musannaf Ibn Abi Shayba 22:18

Muhammad ibn Fudayl narrated to us, from ‘Ata’ ibn al-Sa’ib, from Abu ‘Abd al-Rahman, who said: Those who used to teach us from the companions of the Messenger of Allah (may Allah bless him and grant him peace) said that they used to learn ten verses from the Messenger of Allah (may Allah bless him and grant him peace), and they would not proceed to the next ten until they had learned what was in these [ten] regarding action and knowledge. So we learned the action and the knowledge.