I know that after my departing grievous wolves shall enter in among you, not sparing the flock;

I know that after my departure, savage wolves will come in among you and will not spare the flock.

for I have known this, that there shall enter in, after my departing, grievous wolves unto you, not sparing the flock,

[For] I know [this,] that there will come in amongst you after my departure grievous wolves, not sparing the flock;