لِّتُؤْمِنُوا بِاللَّهِ وَرَسُولِهِ وَتُعَزِّرُوهُ وَتُوَقِّرُوهُ وَتُسَبِّحُوهُ بُكْرَةً وَأَصِيلًا
“so that you [believers] may have faith in Allah and His Messenger, support and honor him, and glorify Allah morning and evening.”
This ayah is part of Surah al-Fath, revealed -- as this event's own significance note states -- "concerning this incident" (Q48:1), the Treaty of Hudaybiyyah.