It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "The best of companions in the sight of Allah is the one who is best to his companion, and the best of neighbours in the sight of Allah is the one who is best and most well-wishing to his neighbour." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), and they did not record it.