Verse 6

وَمَآ أَفَآءَ ٱللَّهُ عَلَىٰ رَسُولِهِۦ مِنْهُمْ فَمَآ أَوْجَفْتُمْ عَلَيْهِ مِنْ خَيْلٍ وَلَا رِكَابٍ وَلَـٰكِنَّ ٱللَّهَ يُسَلِّطُ رُسُلَهُۥ عَلَىٰ مَن يَشَآءُ وَٱللَّهُ عَلَىٰ كُلِّ شَىْءٍ قَدِيرٌ

What God has bestowed upon His messenger from them was not because you helped him with horses and cavalry, but God gives authority to His messengers as He wills. And God is All Powerful over all things.