Nabi Salallahu alaihi wasallam said:
“Do not abuse my Companions, for if any of you were to spend gold equal to (mountain of) Uhud in charity, it would not equal a handful of one of them or even half of that” [Bukhari, Muslim].
“Whoever abuses my Companions, upon them is the curse of Allah, the angels and all the people” [Saheeh, At-Tabarani].
Abdullah bin Masood Radhiyallahu Anhu has stated:
"Verily Allah looked into the hearts of his servants. Thus He selected Muhammad (Sallallahu Alayhi Wa Sallam). He sent him with his message and He chose him out of his perfect knowledge. Then Allah again looked into the hearts of His servants and He chose the companions of His Nabi (sallallahu alayhi wasallam) . He made them the helpers of His Deen and the ministers of His Nabi(sallallahu alayhi wasallam)." [Musnad Abi Dawud]