Inna allatheena yubayiAAoonaka innama yubayiAAoona Allaha yadu Allahi fawqa aydeehim faman nakatha (surah Al Fath: 10)

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

(48:10) Those who swore fealty to you, (O Prophet), *17 in fact swore fealty to Allah. The Hand of Allah is above their hands. *18 So whoever breaks his covenant breaks it to his own hurt; and whoever fulfils the covenant that he made with Allah, *19 He will bestow on him a great reward.

Innal lazeena yubaayi`oonaka innamaa yubaayi`oonal laaha yadul laahi fawqa aydehim; faman nakasa fainnamaa yuankusu `alaa nafsihee wa man awfaa bimaa `aahada `alihul laaha fasa yu`teehi ajran `azeemaa

*17) The reference is to the pledge that the Holy Prophet took from his Companions at Hudaibiyah at the rumor that Hadrat `Uthman had been killed at Makkah. According to some traditions it was a pledge unto death, and according to others it was an undertaking that they would not nut away from the battlefield. The first thing has been reported from Hadrat Salamah bin Akwa' and the second from Hadrat Ibn `Umar, Jabir bin `Abdullah and Ma'qil bin Yasar. The purport of both is the same. The Companions had pledged allegiance on the Holy Prophet's hand with the express object that if the news of Hadrat `Uthman's martyrdom proved to be true, they would settle the matter with the Quraish there and then even if they were cut to pieces in the clash. As on this occasion it was not yet certain whether Hadrat `Uthman actually had been killed or was still living, the Holy Prophet placed one of his own hands on the other and pledged allegiance on his behalf, and thus bestowed a unique honour on Hadrat `Uthman in that he made Hadrat 'Uthman a partner in the pledge by making his own sacred hand represent the hand of Hadrat `Uthman. The Holy Prophet's taking the pledge of allegiance on his behalf necessarily meant that he had full confidence that if Hadrat `Uthman had been present he would certainly have pledged the allegiance.
*18) That is, the hand on which the Muslims were swearing allegiance was not the hand of the Prophet's person but of Allah's representative, and this allegiance was in fact being sworn to Allah through His Messenger. .
*19) Here, instead of `alaih-illah the words used in the original are alaihullah, which is a departure from the general rule of Arabic. `Allama Alusi has given two reasons for the unusual use of the vowel points here. First, the object on this special occasion is to express the great glory, eminence and majesty of the Being to Whom the pledge was being sworn for which alaih-u is more appropriate than `alaih-i; second, the ha in alaih-i actually represents howe; therefore, adhering here to the vowel points of the original goes well with the theme of the aIlegiance.