Al-Fath 48:18

۞لَّقَدۡ رَضِيَ ٱللَّهُ عَنِ ٱلۡمُؤۡمِنِينَ إِذۡ يُبَايِعُونَكَ تَحۡتَ ٱلشَّجَرَةِ فَعَلِمَ مَا فِي قُلُوبِهِمۡ فَأَنزَلَ ٱلسَّكِينَةَ عَلَيۡهِمۡ وَأَثَٰبَهُمۡ فَتۡحٗا قَرِيبٗا 18

Certainly was Allah pleased with the believers when they pledged allegiance to you, [O Muhammad], under the tree, and He knew what was in their hearts, so He sent down tranquillity upon them and rewarded them with an imminent conquest