Mine hand also hath laid the foundation of the earth, and my right hand hath spanned the heavens: when I call unto them, they stand up together.
(Isaiah 48:13) KJV
The basic building block of Hebrew poetry is the couplet (also called a distich or bicolon), which consists of two contiguous lines related to each other by form and by content.
– Couplet, definition Biblical Poetry
This is the normal structure of a couplet:
A1 , A2 : B1 , B2
In general the two sides of the couplet, either side of the [:], are equivalent, and so one is used to develop the meaning of the other.

February 4th – To Sink, Sank
We’ve connected the phrases established the world, and setteth fast the mountains, with sinking down.