This lesson is about the three messenger. The three messengers are described in Chapter 1 and 2 of the book The Life of Buddha Shakyamuni:
​The Life of Buddha Shakyamuni

1. Q: What are the three messengers?
2. Q: Why did Siddhartha turn to seeking salvation from suffering?

The five messengers https://suttacentral.net/mn130/en/sujato?lang=en&layout=linebyline&reference=none&notes=asterisk&highlight=false&script=latin

1. Q: What does the house metaphor show?
2. Q: What are the five messengers in the sutta:

1. Clarification: sometimes the suttas mention three messengers (sickness, old age, death); sometimes the suttas mention five (birth, sickness, punishment, old age, death). Birth and punishment are subsumed under death.