What does Exodus 31:18 mean?

When God finished speaking with Moses on Mount Sinai, he gave him two stone tablets, written by God's own finger, with the terms of the agreement. Exodus 31:18 - Modern Text Bible

(God hands over the physical tablets of the covenant, showing the seriousness and permanence of what he's just said. These aren't just words—they're the foundation of the relationship between God and his people.)