الْإِنسَانَ  (mankind): All mankind, however, it was said that here it refers to disbelievers.

Allah (swt) describes mankind as ungrateful; sometimes does not remember that the duty of his mind is to have faith in Allah (swt), he does not accept the disasters and misfortunes that happen to him. Ibn Abbas (may Allah be pleased with him) said that This verse was revealed because of Qert Ibn Abdullah Ibn Nawfal Al-Qurashi, who had all these characteristics. It is said, as well, that it was revealed because of Al-Walid Ibn Al-Mughirah. Hence, the ungrateful is the one who breaches the pledge, averts the truth and follow his whim. However, Allah (swt) here judges that humans are such as this, so that He (swt) is reminding him of it, and specifies the one who is discontent with his Lord; whenever a misfortune happens to him, he forgets the blessing and looks at the indignation. This human will bring nothing good or beneficial, nor for him neither for others, just the same like the ungrateful land that grows nothing.