God's commands to Israel are spoken of as if he had given them in an audible voice. See how you translated this in [Hebrews 3:7](../03/07.md). Alternate translation: "if you hear God speaking" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Here "hearts" is a metonym for a person's mind. The phrase "harden your hearts" is a metaphor for being stubborn. See how you translated this in [Hebrews 3:8](../03/08.md). Alternate translation: "do not be stubborn" or "do not refuse to listen" (See: [[rc://en/ta/man/translate/figs-metonymy]])