Nepotism of David
Source: Nav
2 Samuel 8:16
Joab son of Zeruiah was over the army; Jehoshaphat son of Ahilud was the recorder;
2 Samuel 19:13
And say to Amasa, ‘Aren’t you my flesh and blood? May God punish me, and ever so severely, if from this time you are not the commander of my army in place of Joab!’”