And he said to the one whom he knew would go free, (12:42)

Almuntakhab Fi Tafsir Alquran Alkarim

Then said he to the inmate whom he thought would be released: Mention my name and my story, O fellow, to the king when you are in his presence. But in the midst of the court he -the servant- yielded to the lower part of his nature which is guided by AL-Shaytan and forgot to mention to the king the story of his fellow prisoner. By consequence, Yusuf remained in confinement for a few years - said to be not less than three years

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

(12:42) Then to the one who he thought would be released. Joseph said, "Mention me to your lord (the king of Egypt)". But Satan made him so neglectful that he forgot to mention him to his lord, and so Joseph remained in the prison for several years. *35

And he said to the one whom he knew would go free, meaning

*35) Some commentators have interpreted it like this: "Satan made Prophet Joseph neglectful of his Lord, AIlah, so he placed his confidence in a man rather than Allah and desired him to mention him to his lord, the king, for his release. So AIlah punished him by letting him languish several years in the dungeon" In fact, such an interpretation is absolutely erroneous for as 'Allamah Ibn Kathir and some early commentators like Mujahid, Muhammad-bin-Ishaq and some others say, the pronoun "him" refers to that person who he thought would be released. Therefore it will mean: "Satan made him (the would-be free man) so neglectful that he forgot to mention him (Prophet Joseph) to his lord (the king)." They also cite a tradition in support of their interpretation to this effect. The Holy Prophet said, "If Prophet Joseph had not said that which he said, he would not have remained in imprisonment for several years." But `Allamah Ibn Kathir says, "This Hadith cannot be accepted because all the ways in which it has been reported arc weak. Moreover, two of the reporters, Sufyan-bin-Waki`i and Ibrahim-bin-Yazid, are not trustworthy". Besides being weak on technical grounds, it is also against the dictates of common sense: if a wronged person adopted some measures for his release, he cannot be considered to be neglectful of God and guilty of the lack of trust in Allah.
 

And he said to the one whom he knew would go free, meaning in Urdu

پھر اُن میں سے جس کے متعلق خیال تھا کہ وہ رہا ہو جائے گا اس سے یوسفؑ نے کہا کہ "اپنے رب (شاہ مصر) سے میرا ذکر کرنا" مگر شیطان نے اسے ایسا غفلت میں ڈالا کہ وہ اپنے رب (شاہ مصر) سے اس کا ذکر کرنا بھول گیا اور یوسفؑ کئی سال قید خانے میں پڑا رہا