This is not but the word of a human being." (74:25)

Almuntakhab Fi Tafsir Alquran Alkarim

Then he added, it is nothing but words expressed by mortals; words which to our beliefs do not accord

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(74:25) this is nothing but the word of a mere mortal!' *14

This is not but the word of a human being." meaning

*14) The reference is to what happened in the conference of the disbelievers of Makkah. From the details of it that we have given in the Introduction, it becomes obvious that this man in his heart had become fully convenced of the Qur'an's being Divine Word, but in order to save his position as a chief of his people, he was not prepared to affirm faith. When in the conference he himself turned down all the accusations that the Quraish chiefs were proposing against the Holy Prophet (upon whom be peace), he was compelled to devise an accusation from himself, which could be spread among the Arabs in order to bring a bad name to the Holy Prophet. Then, the way he struggled against his conscience, and the way he devised an accusation at last after a prolonged mental conflict, has been vividly depicted here.
 

This is not but the word of a human being." meaning in Urdu

یہ تو یہ ایک انسانی کلام ہے