"A man should not make another man get up from his (the latter's) seat (in a gathering) in order to sit there."
The above quotation was said by Prophet Muhammad (peace be upon him) Sahih Al-Bukhari Volumn 008, Book 074, Hadith Number 286 Narrated By Ibn 'Umar
"He who amongst you sees something abominable should modify it with the help of his hand; and if he has not strength enough to do that, then he should do it with his tongue; and if he has not strength enough to do even that, then he should (at least abhor it) from his heart; and that is the least of faith."
The above quotation was said by Prophet Muhammad (peace be upon him) Sahih Muslim Hadith 79 Narrated by Abu Sa'id al-Khudri