choose out. Septuagint and Vulgate read "choose for myself".
men. Hebrew. 'ish. App-14.
I will. Ahithophel manifests personal vengeance. See note on 2 Samuel 16:21 with 2 Samuel 17:11.
this night. Compare Psalms 4:8; Psalms 4 is concerning inheritances. David's was in jeopardy (2 Samuel 17:2), but his trust was in Jehovah's favour (2 Samuel 15:26; 2 Samuel 22:20; Psalms 18:19).