15 Now a poor wise man was found in it, and he by his wisdom delivered the city; yet no man remembered that same poor man.
Ecclesiastes 9:15 Cross References - WEB
Genesis 40:23
23 Yet the chief cup bearer didn’t remember Joseph, but forgot him.
2 Samuel 20:22
22 Then the woman went to all the people in her wisdom. They cut off the head of Sheba the son of Bichri, and threw it out to Joab. He blew the trumpet, and they were dispersed from the city, every man to his tent. Then Joab returned to Jerusalem to the king.
Esther 6:2-3
2 It was found written that Mordecai had told of Bigthana and Teresh, two of the king’s eunuchs, who were doorkeepers, who had tried to lay hands on the King Ahasuerus.
3 The king said, “What honor and dignity has been given to Mordecai for this?” Then the king’s servants who attended him said, “Nothing has been done for him.”
Ecclesiastes 2:16
16 For of the wise man, even as of the fool, there is no memory forever, since in the days to come all will have been long forgotten. Indeed, the wise man must die just like the fool!
Ecclesiastes 4:13
13 Better is a poor and wise youth than an old and foolish king who doesn’t know how to receive admonition any more.