Genesis 40:23

ולא זכר שר המשקים AND THE CHIEF OF THE BUTLERS DID NOT REMEMBER HIM on that day, וישכחהו AND HE FORGOT HIM afterwards. Because Joseph had placed his trust in him that he should remember him he was doomed to remain in prison for two years. So it is said (Psalms 40:5) “Happy is the man who maketh the Lord his trust and turneth not to (רהבים) the arrogant” — i.e. doth not trust in the Egyptians who are called arrogant (Genesis Rabbah 89:3 cf. Isaiah 30:7).

וְלֹֽא־זָכַ֧ר שַֽׂר־הַמַּשְׁקִ֛ים אֶת־יוֹסֵ֖ף וַיִּשְׁכָּחֵֽהוּ׃ {פ}

Nevertheless the chief butler did not remember Yosef, but forgot him.