Surah Al-Fath — Ayah 18 (48:18)

English translation (Saheeh International)

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 conquest¹

1. - That of Khaybar, which preceded the conquest of Makkah.

Brief commentary

Verily, Allah was pleased with the believers when they were giving their oaths to you at Ḥudaybīyyah i.e. Bay‘at Al-Riḍwān under the tree. Allah knew of the faith, sincerity and honesty in their hearts and sent down tranquility on their hearts. And He rewarded them for it with a victory in the near future i.e. the victory over Khaybar, as consolation for them missing out on being able to enter Makkah.