1 Chronicles 18:15
Joab the son of Zeruiah was in command of the army, and Jehoshaphat the son of Ahilud was the recorder;
1 Chronicles 11:6
Now David said, “Whoever strikes down a Jebusite first shall be chief and commander.” Joab the son of Zeruiah [David’s half sister] went up first, and so he was made chief.
2 Samuel 8:16
Joab the son of Zeruiah was [commander] over the army; Jehoshaphat the son of Ahilud was recorder (secretary);
1 Kings 4:3
Elihoreph and Ahijah the sons of Shisha, were scribes; Jehoshaphat the son of Ahilud was the recorder [of important events];
Treasury of Scripture Knowledge
Summary
                            And Joab the son of Zeruiah was over the host; and Jehoshaphat the son of Ahilud, recorder.                        
                    Jehoshaphat
Bible References
Joab
                                        1 Chronicles 11:6                                        
                                                                                                                                Now David said, “Whoever strikes down a Jebusite first shall be chief and commander.” Joab the son of Zeruiah [David’s half sister] went up first, and so he was made chief. 
                                    
                                        2 Samuel 8:16                                        
                                                            
                        Joab the son of Zeruiah was [commander] over the army; Jehoshaphat the son of Ahilud was recorder (secretary); 
                                    Jehoshaphat
                                        1 Kings 4:3                                        
                                                            
                        Elihoreph and Ahijah the sons of Shisha, were scribes; Jehoshaphat the son of Ahilud was the recorder [of important events];