Commentary ...
If the messenger of Allah came to them, they would be the best rightly guided of the nations. But when the world illuminating sun of Islam appeared in the horizon of their land and the Prophet of Islam (p.b.u.h.) with the greatest heavenly Book came to them, not only they did not accept it, but also tried to reject it and to play kinds of tricks against it. The abovementioned holy verse was sent down and blamed them for these empty baseless claims.
(Most of the commentary books, has been mentioned under this verse.) The verse says: “And they swore by Allah with the strongest oaths that if a Warner came to them, they would be more rightly guided than any one of the nations; …” The Arabic term /’ayma-n/ is the plural form of /yami-n/ which means ‘oath’.
Originally it means ‘right hand’, but since at the time of taking oath and promising people they shake hands with their right hands and take an oath, this word has gradually been used in the sense of oath. The Arabic word /jahd/ is derived from /jiha-d/ in the sense of ‘struggle and effort’. Therefore, the application of the Arabic phrase /jahd-a-’ayma-nihim/ refers to the strong oath.
Yes, when they were observing the former events recorded in the pages of the history, saying about disloyalties, ingratitude actions, hindrances and crimes of the former nations, specially the Jews unto their prophets, they wondered very much, while they had every kind of claim and boast about themselves.