Reference: Fataawa al-Lajnah ad-Daa.imah lil-Buhooth al-'Ilmiyyah wal-Iftaa. v11 p112 q2 of no.9892
Question: If there occurred some argument/quarrel between a man and his companions during hajj, is his Hajj correct/sound and will it be rewarded even if it was his obligatory [first] Hajj?
Response: His Hajj is correct/sound and will [in shaa.-Allaah] be rewarded as his obligatory [first Hajj], however, his reward will be reduced according to the severity of the ugly argument/quarrel which took place. So it is upon him to repent [to Allaah] for that, as Allaah سبحانه و تعالى says:
And with Allaah lies all success and may Allaah send prayers and salutations upon our Prophet ﷺ and his family and his companions.
