The LORD Does What He Says He Will Do

And the LORD visited Sarah as He had said, and the LORD did unto Sarah as He had spoken.  For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.  And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac.  And Abraham circumcised his son Isaac being eight days old, as God had commanded him. And Abraham was an hundred years old, when his son Isaac was born unto him.  And Sarah said, “God hath made me to laugh, so that all that hear will laugh with me.”  And she said, “Who would have said unto Abraham, that Sarah should have given children suck? For I have born him a son in his old age.”  And the child grew, and was weaned: and Abraham made a great feast the same day that Isaac was weaned.
Genesis 21:1-8

Let all the earth fear the LORD: let all the inhabitants of the world stand in awe of Him.  For He spake, and it was done; He commanded, and it stood fast.
Psalm 33:8-9

…He goeth after her straightway, as an ox goeth to the slaughter, or as a fool to the correction of the stocks; till a dart strike through his liver; as a bird hasteth to the snare, and knoweth not that it is for his life…
Proverbs 7:22-23