Quran english Al Fath 18

لقد رضي الله عن المؤمنين إذ يبايعونك تحت الشجرة فعلم ما في قلوبهم فأنزل السكينة عليهم وأثابهم فتحا قريبا

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

 
Sahih International
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
Muhsin Khan
Indeed, Allah was pleased with the believers when they gave their Bai’a (pledge) to you (O Muhammad SAW) under the tree, He knew what was in their hearts, and He sent down As-Sakinah (calmness and tranquillity) upon them, and He rewarded them with a near victory,
Pickthall
Allah was well pleased with the believers when they swore allegiance unto thee beneath the tree, and He knew what was in their hearts, and He sent down peace of reassurance on them, and hath rewarded them with a near victory;
Yusuf Ali
Allah’s Good Pleasure was on the Believers when they swore Fealty to thee under the Tree: He knew what was in their hearts, and He sent down Tranquillity to them; and He rewarded them with a speedy Victory;
Shakir
Certainly Allah was well pleased with the believers when they swore allegiance to you under the tree, and He knew what was in their hearts, so He sent down tranquillity on them and rewarded them with a near victory,
Dr. Ghali
Indeed Allah has already been satisfied with the believers as they were swearing allegiance to you beneath the tree. So He knew what was in their hearts, then He sent down serenity upon them, and requited them with a near conquest.