Surah Yusuf 12:42

وَقَالَ لِلَّذِى ظَنَّ أَنَّهُۥ نَاجٍ مِّنْهُمَا ٱذْكُرْنِى عِندَ رَبِّكَ فَأَنسَىٰهُ ٱلشَّيْطَـٰنُ ذِكْرَ رَبِّهِۦ فَلَبِثَ فِى ٱلسِّجْنِ بِضْعَ سِنِينَ

And he said to the one whom he knew would go free, "Mention me before your master." But Satan made him forget the mention [to] his master, and he [i.e., Joseph] remained in prison several years.

Translation: Saheeh International

Tafsir

Then he said to the one whom he deemed whom he was certain would be saved of the two — and this was the cup-bearer ‘Mention me to your lord’ your master and say to him ‘There is a young man in jail who has been wrongly imprisoned’. …

Excerpt from Tafsir al-Jalalayn, commentary on 12:42, via Quran.com. The reader has the full commentary and 9 more tafsirs.