Charles Ellicott Commentary 1 Samuel 15:28

"And Samuel said unto him, Jehovah hath rent the kingdom of Israel from thee this day, and hath given it to a neighbor of thine, that is better than thou." — 1 Samuel 15:28 (ASV)

The Lord hath rent the kingdom. —The prophet immediately looks upon the garment torn by the passionate vehemence of the king as an omen for the future, and uses the rent garment as a symbol to show Saul that thus had the Lord on that day rent the kingdom from him.

A neighbour of thine. —It had not yet been revealed to the seer who was to replace the rebellious king, so he simply refers to the future anointed one quite indefinitely as “a neighbour.”