Why did God tell Israel to make Him a sanctuary?

Answer: So He could dwell among them

God said, "They are to make a sanctuary for Me, so that I may dwell among them," following the pattern He showed Moses.

“And they are to make a sanctuary for Me, so that I may dwell among them. You must make the tabernacle and design all its furnishings according to the pattern I show you.”— Exodus 25:8-9 (BSB)