We are not to be like Cain who was of the evil one and murdered (esphaxen | ἔσφαξεν | aor act ind 3 sg) his brother. And why did he murder (esphaxen | ἔσφαξεν | aor act ind 3 sg) him? Because his own deeds were evil and those of his brother were righteous.
Reference
1 John 3:12
Sequence
1