48:18 laqad raDiyal-laahu ‘Anil mu’miniyna idh yubaayi’UUnaka taHtash shajarati fa ‘Alima maa fiy quluubihim fa anzalas sakiynata ‘Alayhim wa athaabahum fatHan qariybaa

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Ahmed Raza Khan: Mohammed Aqib Qadri:
Indeed Allah was truly pleased with the believers when they swore allegiance to you beneath the tree - so He knew what was in their hearts - He therefore sent down peace upon them, and rewarded them with an imminent 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;

Pickthal:
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;