اِلَّا تَنْصُرُوْهُ فَقَدْ نَصَرَهُ اللّٰهُ اِذْ اَخْرَجَهُ الَّذِيْنَ كَفَرُوْا ثَانِيَ اثْنَيْنِ اِذْ هُمَا فِى الْغَارِ اِذْ يَقُوْلُ لِصَاحِبِهٖ لَا تَحْزَنْ اِنَّ اللّٰهَ مَعَنَاۚ فَاَنْزَلَ اللّٰهُ سَكِيْنَتَهٗ عَلَيْهِ وَاَيَّدَهٗ بِجُنُوْدٍ لَّمْ تَرَوْهَا وَجَعَلَ كَلِمَةَ الَّذِيْنَ كَفَرُوا السُّفْلٰىۗ وَكَلِمَةُ اللّٰهِ هِيَ الْعُلْيَاۗ وَاللّٰهُ عَزِيْزٌ حَكِيْمٌ ( التوبة: ٤٠ )
Illaa tansuroohu faqad nasarahul laahu iz akhrajahul lazeena kafaroo saaniyasnaini iz humaa filghaari iz yaqoolu lisaahibihee la tahzan innnal laaha ma'anaa fa anzalallaahu sakeenatahoo 'alaihi wa aiyadahoo bijunoodil lam tarawhaa wa ja'ala kalimatal lazeena kafarus suflaa; wa Kalimatul laahi hiyal 'ulyaa; wallaahu 'Azeezun Hakeem; (at-Tawbah 9:40)
Sahih International:
If you do not aid him [i.e., the Prophet (^)] – Allah has already aided him when those who disbelieved had driven him out [of Makkah] as one of two, when they were in the cave and he [i.e., Muhammad (^)] said to his companion, "Do not grieve; indeed Allah is with us." And Allah sent down His tranquility upon him and supported him with soldiers [i.e., angels] you did not see and made the word of those who disbelieved the lowest, while the word of Allah – that is the highest. And Allah is Exalted in Might and Wise. (At-Tawbah [9] : 40)
1 Mufti Taqi Usmani
If you do not help him, (it makes no difference to the Prophet, because) Allah has already helped him when the disbelievers expelled him, and he was the second of the two, when they were in the cave, and he was saying to his companion, “Do not grieve. Allah is surely with us.”So, Allah caused His tranquility to descend on him,and supported him with troops that you did not see, and rendered the word of the disbelievers humiliated. And the word of Allah is the uppermost. Allah is Mighty, Wise.