كتاب المظالم
Read the English translation first, with the original Arabic directly underneath.
Narrated Anas bin Malik:
Allah's Messenger (ﷺ) said, "Help your brother, whether he is an oppressor or he is an oppressed one."
انْصُرْ أَخَاكَ ظَالِمًا أَوْ مَظْلُومًا