وَلَمْ يَكُن لَّهُ كُفُوًا أَحَدٌ
(112:4) and none is equal with Him in rank.
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.