Second: the monotheism of divinity
And it is singling out Allah Almighty with worship, so everything from worshippers to Allah is divinity.
Monotheism of divinity is the message of all the Messengers from the first to the last of them...Allah said:
"وَلَقَدْ بَعَثْنَا فِي كُلِّ أُمَّةٍ رَّسُولًا أَنِ اعْبُدُوا اللَّهَ وَاجْتَنِبُوا الطَّاغُوتَ " .سورة النحل / آية : 36.
"And verily, We have sent among every Ummah a Messenger (proclaiming): "Worship Allâh (Alone), and avoid (or keep away from) Tâghût[1] (all false deities i.e. do not worship Tâghût besides Allâh)."
And every messenger begins his call with the unification of divinity, as Noah, Hud, Salih and Shuaib, peace be upon them.
يَا قَوْمِ اعْبُدُوا اللَّهَ مَا لَكُمْ مِنْ إِلَهٍ غَيْرُهُ " .سورة الأعراف / آية :59 ، 65 ، 73 ، 85
"O my people, worship Allāh; you have no deity other than Him."
This type of Monotheism is called the monotheism of divinity, considering its addition to Allah.
It is called the Monotheism of worship, considering its addition to the worshiper.
From the book of the believer creed p.78:
The Monotheism of divinity is an important part of the believer’s creed, as it is the fruit of the unification of Godliness, the unification of names and attributes.
Without it, the unification of Godliness, and the unification of names and attributes lose its meaning, and its usefulness will be lost.