Al-Anfal 8:43

Ith yureekahumu Allahu fee manamikaqaleelan walaw arakahum katheeran lafashiltum walatanazaAAtumfee al-amri walakinna Allaha sallama innahuAAaleemun bithati assudoor

[Remember, O Muḥammad], when Allāh showed them to you in your dream as few; and if He had shown them to you as many, you [believers] would have lost courage and would have disputed in the matter [of whether to fight], but Allāh saved [you from that]. Indeed, He is Knowing of that within the breasts.

(Recall) when in your dream, Allah showed them to you few in number. And if He had shown them to you many in number, you would have been demoralized and would have disputed in the matter, but Allah saved (you). Surely, Allah is fully aware of what lies in the hearts.