The Jewish (Hebrew) people grew up following the 10 Commandments and the Law of Moses. The passage from Hebrews 1:1 emphasizes that in the past, God spoke to the forefathers through prophets and in various ways, but in the last days, He has spoken to them through His son, Jesus. The writer of Hebrews is highlighting the superiority of Jesus over the angels and Moses, as the Jewish people were familiar with and followed the teachings and laws of Moses. This passage is meant to encourage them to have faith in the new law brought by Jesus.