مَا قَطَعْتُم مِّن لِّينَةٍ أَوْ تَرَكْتُمُوهَا قَآئِمَةً عَلَىٰٓ أُصُولِهَا فَبِإِذْنِ ٱللَّهِ وَلِيُخْزِىَ ٱلْفَـٰسِقِينَ
“Whatever palm trees you [believers] cut down or left standing intact, it was [all] by Allah's Will, so that He might disgrace the rebellious.”
Refers to the cutting and burning of the Banu Nadir's palm trees during the siege.