بسم الله الرحمن الرحيم

Shaikh Salih al Fawzaan حفظه الله comments regarding His Statement (The Most High):

مَا كَانَ لِبَشَرٍ أَن يُؤۡتِيَهُ ٱللَّهُ ٱلۡكِتَٰبَ وَٱلۡحُكۡمَ وَٱلنُّبُوَّةَ ثُمَّ يَقُولَ لِلنَّاسِ كُونُواْ عِبَادٗا لِّي مِن دُونِ ٱللَّهِ وَلَٰكِن كُونُواْ رَبَّٰنِيِّـۧنَ بِمَا كُنتُمۡ تُعَلِّمُونَ ٱلۡكِتَٰبَ وَبِمَا كُنتُمۡ تَدۡرُسُونَ

It is not (possible) for any human being to whom Allah has given the Book and Al-Hukma (the knowledge and understanding of the laws of religion, etc.) and Prophethood to say to the people: “Be my worshippers rather than Allah’s.” On the contrary (he would say): “Be you Rabbaaniyun (learned men of religion who practise what they know and also preach others), because you are teaching the Book, and you are studying it.” (Surah Aali-Imraan:79)

What we understand from this verse is that the messengers and their followers do not call to shirk, rather the only ones that call to shirk are the enemies of the messengers (عليهم الصلاة و السلام) and the enemies of the Rabbaniyun (learned men of religion who practise what they know and also preach others), so these enemies are those that call people to shirk, so if you see someone who calls to shirk and to the worship of tombs and graves in this time and other than this time, and he makes that look desirable to the people then you should know (for sure) that this person is an opposer of the messengers and an opposer of the Rabbaaniyun, even if he is a scholar. If he neither calls to tawheed nor forbids shirk, then he is only a person who knows and not a Rabbaaniy, rather he has knowledge but does not act in accordance to his knowledge. He is someone who earns Allaah’s Anger, because he knows the truth but does not act in accordance to it.

So this ruling is from the greatest of what this noble verse shows, that the one who is truly from the followers of the messengers is he who calls to Islamic Monotheism, the worship of Allah alone and not ascribing partners to him in worship, he forbids the people from the worship of anything other than Allaah, such as idols, statues, trees, stones, graves and tombs; but if his call is in opposition to this way then he is calling to the worship of other than Allah, because this call of his is not upon the way of the messengers, nor upon the way of the Rabbaniyun, rather he is a scholar of misguidance just as he  صلى الله عليه وسلم said:

إنما أخاف على أمتي الأئمة المضلين

Indeed what I fear the most for my ummah are the misguided scholars. (3)

Min Ahkhaam Al-Qur’aan by Shaikh Salih al Fawzaan حفظه الله  vol.1 pgs. 23-24
1) Abu Dawud (4252), TIirmidhi (2229) narrated by Thaubaan رضي الله عنه