Sick are their hearts, and God adds to their malady. For them is suffering for they lie.
10
Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (in their hearts is a disease), doubt, hypocrisy, conflict and darkness (so allah increaseth their disease), increased their doubt, hypocrisy, conflict and darkness. (and a painful doom is theirs), they will have a painful torment in the hereafter which shall extend to their hearts, (because they lie) in secret, the reference here being to the hypocrites: 'abdullah ibn ubayy, jadd ibn qays and mu'attib ibn qushayr.
Jalāl al-Dīn al-Maḥallī
تفسير : in their hearts is a sickness: doubt and hypocrisy, which ails their hearts, debilitating them; and god has increased their sickness with what he has revealed in the qur’ān, since they disbelieve it; and there awaits them a painful chastisement because they used to lie (read yukadhdhibūn to imply [that they used to call] the prophet of god [a liar], or yakdhibūn to imply their [mendacity when] saying ‘we believe’).
