See how they fabricate lies about God, which is a clear sin.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (see) o muhammad, (how they invent lies about allah!) by saying: the sins that we commit during the day will be forgiven at night, and the sins we commit during the night will be forgiven in the day. (that of itself is flagrant sin) a clear lie about allah.
Jalāl al-Dīn al-Maḥallī
تفسير : consider, in amazement, how they invent falsehood against god, in that way, and that suffices for a clear, an evident, sin.