Peter is referring to the apostles. The apostles have the message from the prophets that they know is the truth from God. (See: [[rc://en/ta/man/translate/figs-exclusive]])
Peter is saying to the believers to pay close attention to the prophetic message.
## It is like a lamp shining in a dark place until the morning comes ##
The prophetic word is compared to a lamp that gives light in the dark until light comes in the morning. (See: [[rc://en/ta/man/translate/figs-simile]])
## and the morning star rises in your hearts ##
The morning star is Christ coming to live in the believers heart. (See: [[rc://en/ta/man/translate/figs-metaphor]])