The Prophet (ﷺ) said: “He is not a believer whose stomach is filled while his neighbour goes hungry.” (AlAdab Al-Mufrad)

The Prophet (ﷺ) said: “None of you [truly] believes until he loves for his brother that which he loves for himself.” (Bukhari and Muslim)

The Prophet (ﷺ) said: "Jibril kept advising me about treating neighbours kindly and politely, so much so that I thought he would order me to make them my heirs.” (Bukhari and Muslim)

The Prophet (ﷺ) said, "A believer to another believer is like a building whose different parts enforce each other." The Prophet (ﷺ) then clasped his hands with the fingers interlaced (while saying that). (Bukhari)

Narrated Aisha: I said, "O Allah's Messenger (ﷺ)! I have two neighbors; which of them should I give a gift to?"The Prophet (ﷺ) said, "(Give) to the one whose door is nearer to you" (Bukhari)