Matthew 5:14

You are the light of the world: a city that lies upon a mountain can not be hid:

John 8:12

Then Jesus spoke to them again, saying: I am the light of the world; he that follows me shall not walk in darkness, but shall have the light of life.

John 12:36

While you have the light, believe in the light, that you may become the sons of light. These things spoke Jesus, and he departed, and concealed himself from them.

Philippians 2:15

that you may be without reproach and Harmless, the children of God, without blame, in the midst of a wicked and perverse generation, among whom you shine as luminaries in the world,

John 5:35

He was the burning and shining lamp; and you were willing, for a time, to rejoice in his light.

Romans 2:19-20

if you are also confident that you yourself are a guide for the blind, a light to those who are in darkness,

2 Corinthians 6:14

Be not unequally yoked together with unbelievers: for what fellowship has righteousness with lawlessness? What communion has light with darkness?

Ephesians 5:8-14

For you were formerly darkness; but now you are light in the Lord: walk as children of light;

1 Thessalonians 5:5

You are all sons of light, and sons of day: we are not of night, nor of darkness.

Revelation 1:20-1

the mystery of the seven stars which you saw in my right hand, and the seven golden candlesticks. The seven stars are the angels of the seven churches; and the seven candle sticks are the seven churches.

Revelation 21:14-27

And the wall of the city had twelve foundations, and on them were the names of the twelve apostles of the Lamb.

Treasury of Scripture Knowledge

Summary

Ye are the light of the world. A city that is set on an hill cannot be hid.

Bible References

The light

John 5:35
He was the burning and shining lamp; and you were willing, for a time, to rejoice in his light.
John 12:36
While you have the light, believe in the light, that you may become the sons of light. These things spoke Jesus, and he departed, and concealed himself from them.
Romans 2:19
if you are also confident that you yourself are a guide for the blind, a light to those who are in darkness,
2 Corinthians 6:14
Be not unequally yoked together with unbelievers: for what fellowship has righteousness with lawlessness? What communion has light with darkness?
Ephesians 5:8
For you were formerly darkness; but now you are light in the Lord: walk as children of light;
Philippians 2:15
that you may be without reproach and Harmless, the children of God, without blame, in the midst of a wicked and perverse generation, among whom you shine as luminaries in the world,
1 Thessalonians 5:5
You are all sons of light, and sons of day: we are not of night, nor of darkness.
Revelation 1:20
the mystery of the seven stars which you saw in my right hand, and the seven golden candlesticks. The seven stars are the angels of the seven churches; and the seven candle sticks are the seven churches.
Revelation 2:1
To the angel of the church in Ephesus, write: These things says he that holds the seven stars in his right hand, that walks in the midst of the seven golden candlesticks;

A city

Revelation 21:14
And the wall of the city had twelve foundations, and on them were the names of the twelve apostles of the Lamb.