"Among three persons walking side by side, there must be one I can learn from."
"Among three persons walking side by side, there must be one I can learn from."
Meaning: I'm very busy. For example, "I'd like to stay and help, but I've got things to do, places to go and people to see."
When three people are walking together, there must be a teacher for me.
Confucian Analects.