The Quran

فَلَمّا أَنجاهُم إِذا هُم يَبغونَ فِي الأَرضِ بِغَيرِ الحَقِّ ۗ يا أَيُّهَا النّاسُ إِنَّما بَغيُكُم عَلىٰ أَنفُسِكُم ۖ مَتاعَ الحَياةِ الدُّنيا ۖ ثُمَّ إِلَينا مَرجِعُكُم فَنُنَبِّئُكُم بِما كُنتُم تَعمَلونَ

Muhammad Asad

Yet as soon as He has saved them from this [danger], lo! they behave outrageously on earth, offending against all right!¹ O men! All your outrageous deeds are bound to fall back upon your own selves!² [You care only for] the enjoyment of life in this world: [but remember that] in the end unto Us you must return, whereupon We shall make you truly understand all that you were doing [in life].

See verse 12 (of which the above passage is a parabolic illustration) and the corresponding notes.
Lit., "your outrageousness (baghy) is only against your own selves". Cf. the oft-recurring Qur'anic expression, "they have sinned against themselves" (zalamu anfusahum, lit., "they have wronged themselves"), indicating the inevitability with which every evil deed damages its perpetrator spiritually.