Abdullah bin al-Samit narrates that Sayyiduna Abu Dharr (may Allah be pleased with him) said: "The Messenger of Allah (peace and blessings be upon him) ordered me to maintain ties with my relatives even if they turn away from me; to speak the truth even if it is bitter; not to let the blame of any blamer affect me in the matter of Allah; to love the poor and sit with them; to look at those beneath me and not to look at those above me; and to say La hawla wa la quwwata illa billah (There is no might and no power except with Allah) abundantly."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1635