““For I, the LORD, don’t change; therefore you, sons of Jacob, are not consumed.”
“God is not a man, that he should lie, nor a son of man, that he should change his mind. Has he said, and will he not do it? Or has he spoken, and will he not make it good?”
“Before the mountains were born, before you had formed the earth and the world, even from everlasting to everlasting, you are God.”
“This is what the LORD, the King of Israel, and his Redeemer, the LORD of Hosts, says: “I am the first, and I am the last; and besides me there is no God.”
“For the high and lofty One who inhabits eternity, whose name is Holy, says: “I dwell in the high and holy place, with him also who is of a contrite and humble spirit, to revive the spirit of the humble, and to revive the heart of the contrite.”
“For the invisible things of him since the creation of the world are clearly seen, being perceived through the things that are made, even his everlasting power and divinity, that they may be without excuse.”
“Yeshua the Messiah is the same yesterday, today, and forever.”
“Every good gift and every perfect gift is from above, coming down from the Father of lights, with whom can be no variation, nor turning shadow.”
“I am the Alef and the Tav, the First and the Last, the Beginning and the End.”
By these and many more proclamations does the Word of YHWH reveal His constant, persistent, and perpetual nature. He does not change.
This is the basis for our trust in His Word. His promises and His Covenants are timeless and as such are reliable. They are what we fall back on when we have doubts in this life. As part of His Word (which IS YHWH), they are testable. Each and every one of His promises and Covenants up to this point have been fulfilled with a few left to happen for our hope and expectations.
It is important (and the goal of YHWH) that all His people become familiar with and aware of His promises and Covenants so that they will be prepared for the future.