Fala tuAAjibka amwaluhum wala awladuhum innama yureedu Allahu liyuAAaththibahum biha fee alhayati (surah Tawbah: 55)

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

(9:55) So let not their great wealth and the large number of their children delude you; for Allah wills to chastise them by means of these very things in this worldly lifes *54 and that they would die in a state of unbelief. *55

Falaa tu`jibka amwaaluhum wa laaa awlaaduhum; innamaa yureedul laahu liyu`az zibahum bihaa fil hayaatid dunyaa wa tazhaqa anfusuhum wa hum kaafiroon

*54) "Allah wills to chastise them by means of these things in this world", because of their great love for their children and wealth as these misled them to adopt the hypocritical attitude which, in turn, degraded them in the Muslim society. Consequently, in the Islamic System they would lose the respect, tire reputation and the prestige they enjoyed in the pre-lslamic society. On the contrary, even the Muslim slaves and the sons of slaves, the farmers and the shepherds, who proved the sincerity of their Faith would win honour in the new system, and the big hereditary chiefs, who refrained from this because of their love of the world, would lose their fame, honour and prestige.
In order to illustrate the above we cite an incident that happened during the Caliphate of Hadrat `Umar. Once some big chiefs of the Quraish including Suhail-bin-`Amr and Harith-bin-Hisham, went to see Caliph Umar and took their seats near him. Soon after this some humble people from among the Muhajirin and the Ansar came there. The Caliph asked those chiefs to make room for them, and seated these humble people near his own seat. This went on for some time till these chiefs reached the remotest corner in the assembly. When they carne out, Harith-bin-Hisham said to his companions, "You have noticed what a humiliating treatment has been meted out to us today!" Suhail-bin-`Amr replied, "It is no fault of `Umar but it is our own fault. When we were invited to Islam, we turned away from it, but these humble people accepted it and made sacrifices for it. " Then both of them returned to the meeting and said "Today we have noticed your treatment and we feel that it is all due to our own shortcomings, but tell us if there is a way for us to make atonements for our past failures" . The Caliph did not make any reply but merely pointed towards the Roman territory, which meant that the only way of regaining their prestige was to expend their lives and wealths in doing Jihad there.
*55) "They would die in a state of unbelief" because of their hypocrisy, which would not let them attain sincere Faith till they die. Thus after ruining their moral and spiritual lives in this world, they would leave it in the state of unbelief, which will ruin their lives in the Hereafter in a far worse way.