Al-Fath 48:18

Laqad radiya Allahu AAanialmu/mineena ith yubayiAAoonaka tahta ashshajaratifaAAalima ma fee quloobihim faanzala asakeenataAAalayhim waathabahum fathan qareeba

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

Allah was pleased with the believers when they were pledging allegiance with you (by placing their hands in your hands) under the tree, and He knew what was in their hearts, so He sent down tranquility upon them, and rewarded them with a victory, near at hand,