Quran 2:208 — The Heifer (Al-Baqarah)

O you who believe, you shall embrace total submission; do not follow the steps of Satan, for he is your most ardent enemy.

[2:207] Then there are those who dedicate their lives to serving GOD; GOD is compassionate towards such worshipers.

[2:209] If you backslide, after the clear proofs have come to you, then know that GOD is Almighty, Most Wise.