Shaykh Muhammad bin Haadee said about Yahya al-Hajuri:

His revilement, and that of his students against the Scholars of the Sunnah has increased, it has exceeded the limit, and no one has been safe from him... he is an idiotic man, he has nothing with him but idiocy, abuse, revilement. And for what will (one) go to Dammaaj for benefit from Yahyaa except (learning) abuse, idiocy and revilement.. he is like Faalih, rather more severe than Faailh ... he (al-Hajuri) does not know the language of knowledge in reality ... the Scholars of the Sunnah, the heads of the Salafi da'wah are reviled in his gathering through poems, and he praises those revilers ... Shaykh Rabee was reviled lately through a poem and he (al-Hajuri) says to the reviler "BaarakAllaahu feek" (may Allaah bless you), and take this (as a measure), what, by Allaah, is said about the likes of this? If this is not foolishness (idiocy), then I do not know of any idiocy ... the institute at Dammaaj was opened to teach the Sunnah, not for reviling the Scholars of the Sunnah, and the Shaykhs of the Sunnah, reviling them and attacking them. But now Yahya al-Hajuri, the idiot, has changed to this...

From a well-known and distribute recording, as cited on page 14 of the book, "They Turned Dammaaj Into a Torch of Fire After It Was a Torch of Light" (read here).

Read the above admonition with these admonitions from Shaykh Muhammad bin Abdul-Wahhab al-Wasaabee (see here), who is the senior-most of the students of Shaykh Muqbil:

O Allah bear witness, we do not wish that the mistake of Dammaaj should be repeated. They made it a torch of fire after it was a torch of light. They changed it into a torch of fire after it was a torch of light. The recompense for an action is of its like, and as you behave and deal (with others), then likewise it will be done to you. Look at Shaykh Abdur-Rahmaan [whom the Hajaawirah attacked and made tabdee' of], he was patient, he did not speak, and he just continued on, he bore their harm... and some of them were saying that they have been making du'a against him since 1428H. But look what happened, they got overturned on their heads, and their du'a in fact fell upon themselves. They made du'a against a Sunni Shaykh who calls to Tawheed and Sunnah and to the aqeedah and to fiqh, a Sunni Shaykh! It did not harm him alhamdulillaah, but it harmed you and whoever is upon your way. It is as if you O fulaan, when you make du'a, then the angels say "and the same to you", every time you made du'a [against Shaykh Abdur-Rahman) the Angels said "and the same to you" and it did return upon you and from Allaah is aid sought.

Brothers, take lesson from Dammaaj, the mother of all centers (umm al-maraakiz), how it used to be in the life of Shaykh Muqbil (rahimahullaah), it was a torch of light. There was love, affection, respect, mercy, knowledge, action, teaching, da'wah to Allaah and so on. Then when came al-Hajuri, what did he do? He destroyed it. He demolished it. Dammaaj did not fall at the hands of the Houthis, they only came afterwards. They came after al-Hajuri came and destroyed Dammaaj. Revilements, abuse, cursing, cutting off, turning backs on each other, revilements upon scholars, cursing, giving fatwas without evidences. The Houthis only came afterwards when Dammaaj was already destroyed by al-Hajuri

The maraakiz are many and the duroos are many, so there is abundance so fear Allaah and keep away from qeel and qaal (i.e. speaking about other maraakiz and students and scholars), speaking about the Shaykh of markaz and speaking about this and that. This is what destroyed Dammaaj. "Allaah does not change the condition of a people until they change what is with themselves" (13:11). The verse contains the precursor (muqaddimah) and the end-result (khaatimah). When they change what is with themselves, the situation will be made to change over them. When they change then the end-result will come to them. There is no doubt that Dammaaj has been changed, but this did not happen until they changed, this would not have happened. If they remained upright, upon respect of others, not having mockery, belittlement, abuse of others, the situation would not have changed upon them, but they changed. When you correct or refute a Sunni, do so with utmost adab, within the limits of the legislation. If they remained like this, the situation would not have changed upon them. But when they changed, the situation was made to change upon them. Do you want to experience the same thing as them? Preserve your time, wherever you may be in any markaz or any centre from the centres of the Sunnah. Show respect and manners.