Where will we go in this life, if we don't go towards the One we will eventually end up going to for an eternity?
And flee towards Allah!
God Almighty
He did not say what we have to run from. Not mentioning what we need to flee away from makes this sentence so much stronger. It means that we need to run away from EVERYTHING which stops us from fleeing towards Allah. And the only thing which stops us from running away from Allah is prayer. In prayer, we run away from everything, even from our own passions and desires to direct ourselves entirely to Allah Almighty. This is why prayer is so important. It is bringing into practice a Divine command:
Flee towards Allah!