Chetvāsutta

sn1.71:3.1 “When anger’s slain you sleep at ease.

sn1.71:3.2 When anger’s slain there is no sorrow.

sn1.71:3.3 Anger has a poisonous root

sn1.71:3.4 and a sweet tip, O deity.

sn1.71:3.5 The noble ones praise its killing,

sn1.71:3.6 for when it’s slain there is no sorrow.”