To (communicate) to your heart that you may be a warner
194
Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (upon your heart) according to your memorisation; it is also said that this means: when it was recited to you, (that thou mayst be (one) of the warners) by means of the qur'an,
Jalāl al-Dīn al-Maḥallī
تفسير : upon your heart, that you may be [one] of the warners,