قَدِيمٌ بِلَا ابْتِدَاءٍ، دَائِمٌ بِلَا انْتِهَاءٍ.
He is without any beginning and remains forever without any end.
Qadīm bilā ibtidāʾ signifies that Allah has always existed; His existence did not begin at a particular point.
Dāʾim bilā intihāʾ signifies that His existence will never cease.