The interesting thing about this chapter is verse 29. 'And also the Strength of Israel will not lie or relent. For He is not a man that He should relent.'
29. Moreover the Glory of Israel will not recant {Q Ms Gk: MT [deceive]} or change his mind; for he is not a mortal, that he should change his mind.” (NRSV)
Let us take a look at this verse in context,
22. And Samuel said,
“Has the Lord as great delight in burnt offerings and sacrifices,
as in obedience to the voice of the Lord?
Surely, to obey is better than sacrifice,
and to heed than the fat of rams.
23. For rebellion is no less a sin than divination,
and stubbornness is like iniquity and idolatry.
Because you have rejected the word of the Lord,
he has also rejected you from being king.”
24. Saul said to Samuel, “I have sinned; for I have transgressed the commandment of the Lord and your words, because I feared the people and obeyed their voice.
25. Now therefore, I pray, pardon my sin, and return with me, so that I may worship the Lord.”
26. Samuel said to Saul, “I will not return with you; for you have rejected the word of the Lord, and the Lord has rejected you from being king over Israel.”
27. As Samuel turned to go away, Saul caught hold of the hem of his robe, and it tore.
28. And Samuel said to him, “The Lord has torn the kingdom of Israel from you this very day, and has given it to a neighbor of yours, who is better than you.
29. Moreover the Glory of Israel will not recant {Q Ms Gk: MT [deceive]} or change his mind; for he is not a mortal, that he should change his mind.”
30. Then Saul {Heb [he]} said, “I have sinned; yet honor me now before the elders of my people and before Israel, and return with me, so that I may worship the Lord your God.”
31. So Samuel turned back after Saul; and Saul worshiped the Lord. (NRSV)
Samuel is telling Saul that because Saul has “rejected the word of the Lord,” God has rejected Saul from being king. God is adamant about this, and He will not change His mind about it. There is no suggestion, however, that God will not change His mind when circumstance make it appropriate for Him to do so—and, as we have seen, the Scriptures tell us repeatedly that God has changed His mind when the circumstances made it appropriate for Him to do so