Bede

Now the word of the Lord came to Samuel, saying, etc. The repentance of God is not a disturbance of the mind, which often befalls men as they reconsider the evil they have committed thoughtlessly; rather, it is called a change in passing things, while the immutable divine foresight remains; for just as not repenting signifies unwillingness to change what has been established. …

Commentary on Samuel ↗