C. F. Keil and Franz Delitzsch on 1 Samuel 12:22

1Sa 12:22

“For (כּי gives the reason for the main thought of the previous verse, 'Fear not, but serve the Lord,' etc.) the Lord will not forsake His people for His great name’s sake; for it hath pleased the Lord (for הואיל, see at Deu 1:5) to make you His people.” The emphasis lies upon His. This the Israelites could only be, when they proved themselves to be the people of God, by serving Jehovah with all their heart. “For His great name’s sake,” i.e., for the great name which He had acquired in the sight of all the nations, by the marvellous guidance of Israel thus far, to preserve it against misapprehension and blasphemy (see at Jos 7:9).