פּירוש אויף בראשית 41:12

“A Hebrew youth was there with us, a servant of the chief steward” [41:12]. The chief cupbearer said to Pharaoh. The baker and I had dreams and there was with us a Hebrew youth, a servant who properly explained the dreams to us.

Rashi writes here. The favor of an evildoer is not whole. That is to say, when an evildoer does a favor for a righteous person, he does not do it wholeheartedly. When the chief cupbearer wanted to do Joseph a favor to get him out of the prison, he said that Joseph was a youth, a fool. He is not suitable as a leader, a Hebrew who cannot speak our language. He is a servant. It was written in the protocols that no servant could be a king in Egypt.¹¹Rashi, Genesis, 41:12.

Hizkuni writes. The chief cupbearer feared that if Joseph would become king, he would be angry with me that I left him sit for so long and did not help him. Therefore, chief cupbearer spoke ill of Joseph. Hizkuni writes another explanation why he spoke ill. He thought the king would become angry with him when he would discover that such a wise man was sitting in prison.¹²Hizkuni, Genesis, 41:12.

נער עברי עבד A LAD, AN HEBREW, A SLAVE — Cursed be the wicked for the favours they do are never really complete! He mentions him in disparaging language.