Chapter on the Prohibition of Attacking Lineages Established by the Apparent Shari'ah: Allah the Exalted said

The Shaykh : As for the second, which is attacking lineage, its meaning is to insult someone regarding their lineage or to deny their lineage. For example, in the case of insult, one says, "You are from such-and-such a tribe that does not repel the enemy and does not protect the poor," and he mentions their defects.
Or, for example, one says, "You claim to be from the family of so-and-so, but you are not of them. There is no good in you. If you were of this tribe, there would be good in you," or something similar to that.
Then he mentioned the hadith of Abu Hurayrah that the Prophet (peace and blessings be upon him and his family) said meaning two characteristics that people do, and they are among the characteristics of disbelief
And the second is wailing over the dead, where women or men also cry over him, but women do it more, in a manner resembling the cooing of a dove, meaning they come with a cry accompanied by a known sound. This is forbidden, and the Prophet (peace and blessings be upon him) cursed the wailer and the listener. Among the forms of wailing is what some people do today: they gather in the house of the deceased, and food is brought to them, or they prepare the food themselves and gather around it. This is forbidden because the Prophet (peace and blessings be upon him) cursed the wailer and the listener, and these are wailers. This is based on the hadith of Jarir ibn Abdullah al-Bajali (may Allah be pleased with him) who said and he is a noble and well-known Companion. The Companions considered this to be among the forms of wailing. Therefore, the family of the deceased is prohibited from opening their doors for condolences when the deceased dies, because that is an abomination and an innovation. The Companions did not do that. Furthermore, it contains a type of objection to the decree and destiny of Allah. It is obligatory for a person to be satisfied and submit, and to keep his door closed. If someone wants to offer condolences, he will find him in the market or the mosque if he is a man. As for women, there is no need to open the door for them or for them to gather. The important point is that the Prophet (peace and blessings be upon him) said that wailing is from disbelief . Do not be deceived by the actions of people, for Allah says and He the Exalted said The criterion is not the actions of people and that it is a custom; the criterion is the Book of Allah and the Sunnah of His Messenger (peace and blessings be upon him) and the Sunnah of the Rightly Guided Caliphs and the practice of the Companions (may Allah be pleased with them). None of them ever opened his door for those offering condolences, nor did they gather for that. Rather, they considered this to be among the forms of wailing and avoided it as much as possible, because wailing, as you heard, is disbelief, meaning it is among the characteristics of disbelief. The second point is that the Messenger (peace and blessings be upon him) cursed the wailer and the listener. May Allah grant success.