Continuation of the explanation of the hadith: (Ali ibn Abi Talib (may Allah be pleased with him) reported from the Messenger of Allah (peace and blessings be upon him) that when he stood for prayer, he would say:

The Shaykh : Did we explain it, or did we not explain it?
The student: We did not explain it.

The Shaykh : Good. "Allahumma" means "O Allah." This is its original form. The yaa was deleted; the yaa of the vocative was deleted and replaced with a mīm. This is due to the frequent usage and to seek blessing in mentioning the name of Allah (Mighty and Majestic) before the vocative particle, and a mīm was substituted for it. They said that it indicates the collective, so it is as if the supplicant gathered his heart upon Allah... seeking blessing in beginning with the mention of His name (Exalted and Majestic is He). Based on this, we say that "Allah" is a vocative, built on the dammah, in the position of the accusative.
, "al-Malik" means the One possessing perfect sovereignty and complete control. So He (Glorified and Exalted is He) is the King of kings; there is no owner except Allah (Mighty and Majestic). His kingship combines the kingship that is absolute disposal and the kingship that is complete control. For this reason, there are two recitations in Surat al-Fatihah: and . If you combine the two recitations with each other, the result is that He is the Owner of Kingship. In this world, a person may be a king but not an owner; his name is king, but he is not an owner; he has no right of disposal. And a person may be an owner but not a king. A person owns his car but is not a king; he owns his sheep but is not a king. So if you combine the two recitations, "Malik" and "Mālik," the result is that He is the King, the Owner (Glorified and Exalted is He). "There is no deity but You." I ask, what is the meaning of "There is no deity but You"? The brother?
The student: There is no worshipped entity with truth except You.

The Shaykh : There is no worshipped entity with truth except You. So "Ilah" means "Ma'lūh," meaning there is no true worshipped entity except You. As for what is worshipped besides Allah, even if it is called a deity, it is not a deity because it is not with truth. As He (Mighty and Majestic) said:
This is from establishing lordship and worship. Establishing lordship by His saying? "You are my Lord." And worship in His saying because the servant must worship his worshipped entity with what his worshipped entity desires, to the end of it. It is as if the author (may Allah have mercy on him) did not quote it completely, in brief or by restriction, because it is in the night prayer and not a general opening in all prayers, so he did not quote it completely (may Allah have mercy on him).