四分律刪補隨機羯磨 1.417

1.417

(At that time, there were bhikṣus who, having received the upasampadā, were left behind by the assembly of the saṃgha; because they did not recognize transgressions, they ended up committing grave offenses. The Buddha said, "From this day forward, after performing the karman, one should first explain to them the four pārājika dharmas.")