2 Samuel 18:20

And Joab said unto him, thou shall not bear tidings this day,
&c.] Because Joab knew the tidings of Absalom's death would not be acceptable to the king; and Ahimaaz being a good man, and the son of a priest, for whom Joab had a respect, he would not send the tidings by him, which he was sensible would not recommend him to the king:

but thou shalt bear tidings another day;
when any salvation is wrought, or victory obtained, the tidings of which will be welcome:

but this day thou shall bear no tidings, because the king's son is
dead;
and thou must carry the news concerning his death, which it is not proper thou shouldest, being a priest, nor will it be to thine advantage.