And brought together their hearts. If you had spent all that is (8:63)

Almuntakhab Fi Tafsir Alquran Alkarim

And it is He Who united their feeling and thought, their action and interest and their purpose, and caused their spiritual union with Allah. It is He Who made them reconcile themselves with their own hearts and with Allah. Had you spent all the available wealth on earth for this purpose, you would have failed to tune their hearts to one thought. But Allah brought this unison by tuning their frame of mind, their mood and their disposition; Allah is indeed Azizun and Hakimun

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(8:63) and joined their hearts. Had you given away all the riches of the earth you could not have joined their hearts, but it is Allah Who joined their hearts. *46 Indeed He is All-Mighty. All-Wise.

And brought together their hearts. If you had spent all that is meaning

*46). Here the allusion is to that strong bond of love and brotherhood that developed among the Arabs who embraced Islam and whose conversion brought them solidarity. This strong solidarity existed despite the fact that they came from a variety of tribes which had long-standing traditions of mutual enmity. This was a special favour of God on the Muslims, especially evident in the case of the Aws and Khazraj. It was barely a couple of years before their acceptance of Islam that the two clans virtually thirsted for each other's blood. During the battle of Bu'ath both seemed set to exterminate each other. (Ibn Hisham, vol. 1. pp. 427-8-Ed.) To turn such severe enmity into deep cordiality and brotherhood within a span of two or three years and to join together mutually repellent elements into a unity as firm as that of a solid wall as was witnessed in regards to the Muslim community during the life of Prophet (peace be upon him) was doubtlessly beyond the power of any mortal. Were anyone to depend on worldly factors alone, it would have been impossible to bring about such an achievement. God's support was the deciding factor in this development and this only serves to emphasize that Muslims should always seek and depend on God's support and favour rather than on worldly factors.
 

And brought together their hearts. If you had spent all that is meaning in Urdu

اور مومنوں کے دل ایک دُوسرے کے ساتھ جوڑ دیے تم روئے زمین کی ساری دولت بھی خرچ کر ڈالتے تو اِن لوگوں کے دل نہ جوڑ سکتے تھے مگر وہ اللہ ہے جس نے ان لوگوں کے دل جوڑے، یقیناً وہ بڑا زبردست اور دانا ہے