The Holy Quran 100:6 — Surah Al-'Adiyat

Arabic text

إِنَّ ٱلْإِنسَـٰنَ لِرَبِّهِۦ لَكَنُودٌ

Translation

Undoubtedly man (unlike these brave horses) is extremely ungrateful to his Rabb. (Whereas these horses are prepared to give their lives for their masters because of the care they receive, man refuses to obey Allaah's commands even though Allaah created him and provides everything he needs.)

Tafsir (excerpt) — Tafsir Usmani

The ingratitude of man: that is, the self-sacrifice and readiness to lay down their lives in the path of Allah shown by the horsemen who go out in jihad make plain what loyal and grateful servants are like. The man who does not spend in His path the powers given him by Allah is ungrateful and unworthy in the extreme.

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