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wa-mā jaʿalahu llāhu ʾillā bushrā wa-li-taṭmaʾinna bihī qulūbukum wa-mā n-naṣru ʾillā min ʿindi llāhi ʾinna llāha ʿazīzun ḥakīmun
Allah did not appoint it but as a good news, and to reassure your hearts. Victory comes only from Allah. Indeed Allah is all-mighty, all-wise.
— Ali Quli Qarai
Surah Al-Anfal – Verse 10
10 . “And Allah did not appoint it, save as good tidings and that your hearts thereby might be at rest; and no victory is there save from Allah, surely Allah is the Mighty the Wise.”
The descent of the assisting angels for helping the believers has been repeatedly mentioned in the Qur’an. Even at the time of death and giving soul, Allah sends an angel to protect the believers from the satanic temptations by inspiring the Truth to them. There are two kinds of inspiration in the creation of Allah. One of them is from the side of Allah's angels, which inspires calmness, like the current Surah, verse 12, which says:
Another kind is the inspiration of dread which is done by Satan. For example, the Quran says:
Explanations
The assisting angels came down to increase spiritualities of the believers, not to destroy the pagans. The verse says:
(Historically, it is clear who was killed and who was the killer of the slaughtered, but, in the Battle of Badr, the majority of the slaughtered among the pagans were killed by the sword of Ali-ibn-Abitalib (as) ). The victory of the believers in the Battle of Badr was obtained neither as a result of their originative faculty and martial design, nor for their arms, nor because of the angels, but it was only from the side of Allah. The verse says: