When is insulting the Companions considered disbelief?

Question:
He asks: When is insulting the Companions considered disbelief?

Answer:
If he insults them for what they carried of the religion of Allah the Exalted, insulting them for their companionship with the Messenger and for the knowledge they carried and conveyed, this is disbelief in Allah the Exalted. Yes, and the common case is that those who insult the Companions do so from this angle: they insult them because they accompanied the Messenger (peace and blessings be upon him) and became the means between him and the community in conveying the Shari'ah.
They are the ones who carried it and conveyed it to us. We did not live in the time of the Messenger (peace and blessings be upon him), nor did we see the Messenger. But the Companions conveyed to us from the Messenger (peace and blessings be upon him) everything that was revealed to the Messenger (peace and blessings be upon him), from the Qur'an and from the Sunnah. May Allah reward them with the best reward.
The Companions are the ones who struggled in the path of Allah with the Messenger (peace and blessings be upon him) until Allah made this religion manifest, and they struggled after the Messenger (peace and blessings be upon him) until they spread this religion. No one hates them except a hypocrite. No one hates the Companions except a hypocrite. The one who has faith in his heart loves the Companions and does not hate them.