Quran 2:203 — The Heifer (Al-Baqarah)

You shall commemorate GOD for a number of days (in Mena); whoever hastens to do this in two days commits no sin, and whoever stays longer commits no sin, so long as righteousness is maintained. You shall observe GOD, and know that before Him you will be gathered.

[2:202] Each of these will receive the share they have earned. GOD is most efficient in reckoning.

[2:204] Among the people, one may impress you with his utterances concerning this life, and may even call upon GOD to witness his innermost thoughts, while he is a most ardent opponent.