MUHAMMAD (NABI MUHAMMAD S.A.W) — Ayat 24

أَفَلَا يَتَدَبَّرُونَ الْقُرْآنَ أَمْ عَلَى قُلُوبٍ أَقْفَالُهَا

Then do they not reflect upon the Qur'an, or are there locks upon [their] hearts?