Genesi 15:11

And when the fowls came down upon the carcases, Abram drove them away.

Ver. 11. Abram drove them away.] So must we do evil motions and distractive thoughts in holy duties, which else will muster and swarm in our hearts like the flies of Egypt; pestering us worse than the fly in Albertus Magnus, that was ever hankering after the bald head; though he flapt it off again and again, he could not be rid of it.