[8.58] And if you fear treachery on the part of a people, then throw back to them on terms of equality; surely Allah does not love the treacherous.
[8.59] And let not those who disbelieve think that they shall come in first; surely they will not escape.
[8.60] And prepare against them what force you can and horses tied at the frontier, to frighten thereby the enemy of Allah and your enemy and others besides them, whom you do not know (but) Allah knows them; and whatever thing you will spend in Allah's way, it will be paid back to you fully and you shall not be dealt with unjustly.
I'm always fascinated by the variations in the translations. I wish I knew Arabic.
Depending on your age, you may have to know it sooner than you expect.