73:4

Al-Muzzammil 73:4

أَوْ زِدْ عَلَيْهِ وَرَتِّلِ ٱلْقُرْءَانَ تَرْتِيلًا

Aw zid 'alaihi wa rattilil Qur'aana tarteela

or add to it a little; and recite the Qur'an slowly and distinctly.