法苑珠林 70.20

70.20

又緣貪欲不適意故。則有憤怒而起瞋恚。今身若多瞋恚者。死即當墮泥犁地獄。於歷劫中具受眾苦。受苦既畢墮畜生中。作毒蛇蚖蝮虎豹犲。狼在此之中無量生死。以本因緣。若遇微善。劣復人身。復多瞋恚。面貌醜惡。人所憎惡。非唯不與親友實。亦眼不喜見。當知忿恚皆緣瞋惱。

Furthermore, when covetous desire is thwarted, anger arises and ill will is engendered. If one harbors abundant ill will in this life, upon death one will fall into the Niraya hell, fully undergoing manifold sufferings throughout successive kalpas. When this suffering is completed, one falls among animals, becoming a venomous snake, viper, cobra, tiger, leopard, dhole, or wolf, undergoing immeasurable births and deaths among them. Through original karmic causes and conditions, if one encounters a minute amount of good, one may feebly regain a human body, yet will still harbor abundant ill will, with a hideous and foul countenance, loathed by others; not only will relatives and friends not associate with them, but their eyes will dislike even looking upon them. One should know that fury and resentment all stem from ill will and vexation.