Leviticus 25:1
And the Lord spake unto Moses in mount Sinai, saying,
Cross-reference
Leviticus 26:46 summarizes the laws given on Mount Sinai, directly referencing the same setting as this introduction.
Galatians 4:24 allegorically uses Mount Sinai as representing the old covenant—the very mountain where this law was given.
Galatians 4:25 explicitly identifies Hagar with Mount Sinai in Arabia, using the site of this lawgiving as a symbol of slavery.
Numbers 3:1 also records God speaking to Moses on Mount Sinai, using the same formulaic introduction.
Exodus 19:1 also locates the Israelites at Mount Sinai when God spoke — setting the same geographical context for the laws given here.
Numbers 1:1 also introduces a divine speech at Sinai — a similar narrative setting for census instructions.
Numbers 10:12 records the departure from Mount Sinai, the same location where God spoke this law to Moses.