Abdullāh b. Masʿūd – Allāh be pleased with him – said:
When a man amongst us learned ten verses [of the Quran], he would not move on [to the next verses] until he had understood their meanings and how to act by them.
Al-Ṭabarī, Al-Tafsīr 1:80. Shaykh Aḥmad Shākir graded its chain of transmission ṣaḥīḥ.