Umm Salamah (the wife of the Prophet) said: “I was with the Prophet of Allah, sallallaahu ‘alayhi wa sallam, under a blanket when one of the neighbor’s sheep entered through the door and took some bread. So I stood up and took it out of its mouth. The Prophet of Allah, sallallaahu ‘alayhi wa sallam, said: “You should not have taken it so harshly, no harm of a neighbor is taken lightly.”
Al-Manaawi (a scholar) said: “The meaning of this is any form of harm from a neighbor is not taken lightly, for even if it is a small act (like being harsh to his animal) it will still be considered a serious sin. Thus, enduring harm from a neighbor and responding in a good way is one of the best characteristics and manners.”
Al-Hasan (a scholar) said: “Being a good neighbor is not just to refrain from harming them, rather it is to endure if they harm you.”