Allah(swt), Knows everything

 لَقَدْ رَضِيَ اللَّهُ عَنِ الْمُؤْمِنِينَ إِذْ يُبَايِعُونَكَ تَحْتَ الشَّجَرَةِ فَعَلِمَ مَا فِي قُلُوبِهِمْ فَأَنزَلَ السَّكِينَةَ عَلَيْهِمْ وَأَثَابَهُمْ فَتْحًا قَرِيبًا 48:18

(Fathe Muhammad Jalandari)
(اے پيغمبر) جب مومن تم سے درخت کے نيچے بيعت کر رہے تھے تو خدا ان سے خوش ہوا. اور جو (صدق وخلوص) ان کے دلوں ميں تھا وہ اس نے معلوم کرليا. تو ان پر تسلي نازل فرمائي اور انہيں جلد فتح عنايت کي 48:18

(Muhammad Assad)
 48:18 INDEED, well-pleased was God with the believers when they pledged their allegiance unto thee [O Muhammad] under that tree, for He knew what was in their hearts; and so He bestowed inner peace upon them from on high, and rewarded them with [the glad tiding of] a victory soon to come 48:18

(Yousaf Ali)
 48:18 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;48:18