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al-ʾāna khaffafa llāhu ʿankum wa-ʿalima ʾanna fīkum ḍaʿfan fa-ʾin yakun minkum miʾatun ṣābiratun yaghlibū miʾatayni wa-ʾin yakun minkum ʾalfun yaghlibū ʾalfayni bi-ʾidhni llāhi wa-llāhu maʿa ṣ-ṣābirīna
Now Allah has lightened your burden, knowing that there is weakness in you. So if there be a hundred patient men among you, they shall overcome two hundred; and if there be a thousand, they shall overcome two thousand, by Allah’s leave; and Allah is with the patient.
— Ali Quli Qarai
Surah Al-Anfal – Verse 66
66 . “Now Allah has lightened it for you, and He knows that there is weakness in you. So, if there be of you a hundred patient (steadfast men), they will overcome two hundred; and if there be of you a thousand, they will overcome two thousand by the leave of Allah; and Allah is with the patient (steadfast ones).”
The purpose of ‘weakness’, mentioned in the verse, is weakness in Faith and spiritualities, because the troops of Islam had not become decreased from the point of physical strength and number when they defeated. In this verse, and the verse before it, the Qur'an points to three spiritual aspects which are the factors of victory, the absence of which is a preparation for defeat; they are: patience, Faith, and vigilance. Thus, the main function in victory is by the leave and Will of Allah, else, in the Battle of Hunayn, where there were so many fighters Muslims defeated and ran away.
The verse says:
However, the patients are loved by Allah and they are in His refuge. The verse ends as follows: