What are the most specific characteristics of the oneness of worship?

Question:
Some people say: Is sovereignty the most specific characteristic of the oneness of worship?

Answer:
The most specific one is: abandoning shirk (associating partners with Allah). Sovereignty is among the branches of rulings. It is obligatory for the ruler to judge by the Shari'ah. As for judging by other than the Shari'ah, there is a distinction: if he does so intentionally and considers it permissible, it is disbelief (kufr). If he does it out of desire or for a bribe, it becomes a sin, an evil deed, and minor shirk. These are among the unique aspects of the divine laws that follow from the oneness of worship.
Q: Does it fall under the oneness of lordship or the oneness of worship?
A: It varies: sometimes it falls under disbelief, and sometimes it falls under sins. For example, the issue of zina (unlawful sexual intercourse) and the issue of khamr (intoxicants): if one considers them permissible, it becomes disbelief; if one does not consider them permissible, it becomes a sin.