So when Talut departed with the forces, he said: Surely Allah will try you with a river; whoever then drinks from it, he is not of me, and whoever does not taste of it, he is surely of me, except he who takes with his hand as much of it as fills the hand; but with the exception of a few of them they drank from it. So when he had crossed it, he and those who believed with him, they said: We have today no power against Jalut and his forces. Those who were sure that they would meet their Lord said: How often has a small party vanquished a numerous host by Allah's permission, and Allah is with the patient.

And what befell you on the day when the two armies met (at Ohud) was with Allah's knowledge, and that He might know the believers.

They do not ask leave of you who believe in Allah and the latter day (to stay away) from striving hard with their property and their persons, and Allah knows those who guard (against evil).

They only ask leave of you who do not believe in Allah and the latter day and their hearts are in doubt, so in their doubt do they waver.