1 Chronicles 21:6

Averse to his task as Joab was, he may have been indebted to the memory of the exemption of Levi from census for the idea of enlarging upon it and omitting Benjamin as well. The important contents of this short verse are not found in Samuel, so that we can borrow no light thence. But Benjamin was "the least of the tribes" ( 21:1-23 ), and Peele has suggested that God would not permit the numbers of either of these tribes to be lessened, as he foresaw that they would be faithful to the throne of David on the division of the kingdom. Others think that the omission of these tribes in the census may have been due to Joab's recall to Jerusalem before the completion of the work, and to the king's repentance in the interim cutting off the necessity of completing it. This little agrees, however, with the resolute tone and assigned reason contained in this verse. Peele's explanation, meantime, explains nothing in respect of the statement that the king's word was abominable to Joab.