And of the two, to that one whom he consider about to be saved, he said: "Mention me to thy lord." But Satan made him forget to mention him to his lord: and (Joseph) lingered in prison a few (more) years. Yusuf 12:42 ⧉
Tafsir:
Of the two youths who were put in jail, one was a bread maker and the other was a wine-server to the king of Egypt. Both were accused of trying to poison the food of the king. On investigation, the wine-server proved to be innocent of the allegation. He was released from the jail and was again appointed as a wine-server to the king. His dream meant that he was serving wine to the king in dream and after few days he would really serve wine while awake. The bread maker was proved guilty. He was hanged and left for the birds to peck at his body and, in this way, be a lesson to the people. Both the interpretations of Joseph proved to be correct but, after reaching the palace, the wine-server forgot to mention Joseph to the king as promised. He remembered his promise only when the king had a dream and asked his courtiers to interpret it.