وَلَمْ يَكُنْ لَهُ كُفُوًا أَحَدٌ.
And there has never been anyone equal to Him. (Al-Ikhlāṣ 112:4)
Kufuwan denies an equal or counterpart. No other being can be on the same level as Allah.
His being without beginning or end expresses true beginninglessness and endlessness, not equality with the created world.