الفتح · Verse 18 / 29 · Page 513
لَّقَدْ رَضِيَ اللَّهُ عَنِ الْمُؤْمِنِينَ إِذْ يُبَايِعُونَكَ تَحْتَ الشَّجَرَةِ فَعَلِمَ مَا فِي قُلُوبِهِمْ فَأَنزَلَ السَّكِينَةَ عَلَيْهِمْ وَأَثَابَهُمْ فَتْحًا قَرِيبًا
Laqad radiyal laahu 'anil mu'mineena iz yubaayi 'oonaka tahtash shajarati fa'alima maa fee quloobihim fa anzalas sakeenata 'alaihim wa asaa bahum fat han qareebaa
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
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.
Source: Al-Mukhtasar Tafsir — Tafsir Center for Quranic Studies.
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