Isaiah 40:4

Let every valley be lifted up, and every mountain and hill be made low, and let the rough places become level, and the hilltops become a valley,

Isaiah 45:2

I will go before you, and make the rough places level: the doors of brass will be broken, and the iron rods cut in two:

Ezekiel 21:26

This is what the Lord has said: Take away the holy head-dress, take off the crown: this will not be again: let that which is low be lifted up, and that which is high be made low.

Luke 3:5

Every valley will be lifted up, and all the mountains and hills made low, and the twisted will be made straight, and the rough ways smooth;

1 Samuel 2:8

Lifting the poor out of the dust, and him who is in need out of the lowest place, to give them their place among rulers, and for their heritage the seat of glory: for the pillars of the earth are the Lord's and he has made them the base of the world.

Job 40:11-13

Let your wrath be overflowing; let your eyes see all the sons of pride, and make them low.

Psalm 113:7-8

He takes the poor man out of the dust, lifting him up from his low position;

Isaiah 2:12-15

For the day of the Lord of armies is coming on all the pride of men, and on all who are high and lifted up;

Isaiah 42:11

Let the waste land and its flocks be glad, the tent-circles of Kedar; let the people of the rock give a glad cry, from the top of the mountains let them make a sound of joy.

Isaiah 42:15-16

I will make waste mountains and hills, drying up all their plants; and I will make rivers dry, and pools dry land.

Ezekiel 17:24

And it will be clear to all the trees of the field that I the Lord have made low the high tree and made high the low tree, drying up the green tree and making the dry tree full of growth; I the Lord have said it and have done it.

Luke 1:52-53

He has put down kings from their seats, lifting up on high the men of low degree.

Luke 18:14

I say to you, This man went back to his house with God's approval, and not the other: for everyone who makes himself high will be made low and whoever makes himself low will be made high.

Proverbs 2:15

Whose ways are not straight, and whose footsteps are turned to evil:

Treasury of Scripture Knowledge

Summary

Every valley shall be exalted, and every mountain and hill shall be made low: and the crooked shall be made straight, and the rough places plain:

Every mountain

Bible References

Valley

Isaiah 42:11
Let the waste land and its flocks be glad, the tent-circles of Kedar; let the people of the rock give a glad cry, from the top of the mountains let them make a sound of joy.
1 Samuel 2:8
Lifting the poor out of the dust, and him who is in need out of the lowest place, to give them their place among rulers, and for their heritage the seat of glory: for the pillars of the earth are the Lord's and he has made them the base of the world.
Psalm 113:7
He takes the poor man out of the dust, lifting him up from his low position;
Ezekiel 17:24
And it will be clear to all the trees of the field that I the Lord have made low the high tree and made high the low tree, drying up the green tree and making the dry tree full of growth; I the Lord have said it and have done it.
Ezekiel 21:26
This is what the Lord has said: Take away the holy head-dress, take off the crown: this will not be again: let that which is low be lifted up, and that which is high be made low.
Luke 1:52
He has put down kings from their seats, lifting up on high the men of low degree.
Luke 3:5
Every valley will be lifted up, and all the mountains and hills made low, and the twisted will be made straight, and the rough ways smooth;
Luke 18:14
I say to you, This man went back to his house with God's approval, and not the other: for everyone who makes himself high will be made low and whoever makes himself low will be made high.

Every mountain

Isaiah 2:12
For the day of the Lord of armies is coming on all the pride of men, and on all who are high and lifted up;
Job 40:11
Let your wrath be overflowing; let your eyes see all the sons of pride, and make them low.

And the

Isaiah 42:16
And I will take the blind by a way of which they had no knowledge, guiding them by roads strange to them: I will make the dark places light before them, and the rough places level. These things will I do and will not give them up.
Isaiah 45:2
I will go before you, and make the rough places level: the doors of brass will be broken, and the iron rods cut in two:
Proverbs 2:15
Whose ways are not straight, and whose footsteps are turned to evil:

General references

Isaiah 2:14
And on all the high mountains, and on all the hills which are lifted up;
Isaiah 19:23
In that day there will be a highway out of Egypt to Assyria, and Assyria will come into Egypt, and Egypt will come into Assyria; and the Egyptians will give worship to the Lord together with the Assyrians.
Isaiah 49:11
And I will make all my mountains a way, and my highways will be lifted up.
Mark 1:3
The voice of one crying in the waste land, Make ready the way of the Lord, make his roads straight;
Luke 1:16
And through him great numbers of the children of Israel will be turned to the Lord their God.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain