Do the Prophetic Hadiths that command growing and lengthening the beard indicate that shaving it is forbidden, or does the command therein not imply prohibition, similar to the Hadith about the Witr prayer, "Perform Witr, O people of the Qur'an," which came in the form of a command despite it being a voluntary act?

The majority of scholars hold that a Shar'i (Islamic legal) command signifies obligation unless there is an indicator that diverts it to recommendation or permissibility. Some of them said it signifies recommendation or a general request. When a command conflicts with an indicator, the indicator is given precedence. For example, the Almighty’s saying: "And when you are out of Ihrām, then you may hunt" is taken to mean permissibility, because hunting was previously forbidden.

As for Witr, the hadith of the man who asked about Islam indicates that the only obligatory prayers are the five daily ones: "Is there anything else obligatory upon me?" He said: "No, unless you volunteer."

Regarding the beard, the preponderant view is that it is obligatory to let it grow, due to the numerous prophetic commands to let it grow, to differ from the polytheists and the Magians, and it was the custom of the Prophet and his companions. The opinion that shaving it is merely disliked is weak.