Hebrews 12:22

You have come to mount Sion, the city of the living God, the heavenly Jerusalem, to myriads of angels in festal gathering,

Revelation 14:1

Then I looked, and there was the Lamb standing on mount Sion, and along with him a hundred and forty-four thousand bearing his name and the name of his Father written on their foreheads!

Treasury of Scripture Knowledge

Summary

Nevertheless David took the strong hold of Zion: the same is the city of David.

Bible References

Zion

Hebrews 12:22
You have come to mount Sion, the city of the living God, the heavenly Jerusalem, to myriads of angels in festal gathering,
Revelation 14:1
Then I looked, and there was the Lamb standing on mount Sion, and along with him a hundred and forty-four thousand bearing his name and the name of his Father written on their foreheads!