The word kufu' as used in the original means an example, a similar thing, the one equal in rank and position. In the matter of marriage, kufu' means that the boy and the girl should match each other socially.
The verse means that there is no one in the entire universe, nor ever was, nor ever can be, who is similar to Allah, or equal in rank with Him, or resembling Him in His attributes, works and powers in any degree whatever.
(2:83) Remember that We made a solemn covenant with the children of Israel to this effect: worship none save Allah: be good to your parents, to your relatives, to the orphans and to the helpless; speak aright with the people: establish the Salat and pay the Zakat. But with the exception of a few, you all slid back from it and are paying no heed to it even now.