Whoever does a good deed - it is for himself; and whoever does evil - it is against the self. Then to your Lord you will be returned.
English Transliteration
Man AAamila salihan falinafsihi waman asaa faAAalayha thumma ila rabbikum turjaAAoona
Tafsir of Verse 15
Whoso does righteousness, it is to his own gain, and whoso does evil, it is to his own loss; then to your Lord you shall be returned.
If any one does a righteous deed, it ensures to the benefit of his own soul; if he does evil, it works against (his own soul). In the end will ye (all) be brought back to your Lord.