Charles Ellicott Commentary 1 Chronicles 11:14

"And they stood in the midst of the plot, and defended it, and slew the Philistines; and Jehovah saved them by a great victory." — 1 Chronicles 11:14 (ASV)

And they set themselves ... and delivered ... and slew. — These verbs should be singular, as describing the exploit of Shammah (2 Samuel 23:12). After the omission just noticed had become perpetuated in the text, some editor must have altered the words into the plural, supposing that they referred to David and Eleazar (1 Chronicles 11:13).

Saved them. — Samuel, made a great deliverance: transpose one letter, and the Hebrew words are identical. Septuagint and Syriac agree with Samuel.