Encouragement to honor one's neighbor and guest, and the obligation to remain silent unless one has something good to say, and the fact that all of that is part of faith
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
O people, Allah is Good and He therefore, accepts only that which is good. And Allah commanded the believers as He commanded the Messengers by saying: "O Messengers, eat of the good things, and do good deeds; verily I am aware of what you do" (23:51). And He said: "O those who believe, eat of the good things that We gave you" (2:172). He then made a mention of a person who travels widely, his hair disheveled and covered with dust. He lifts his hand towards the sky (and thus makes the supplication): "O Lord, O Lord," whereas his diet is unlawful, his drink is unlawful, and his clothes are unlawful and his nourishment is unlawful. How can then his supplication be accepted?
Reference: Sahih Muslim 1015 In-book : Book 12, Hadith 83 USC-MSA web (English) : Book 5, Hadith 2214 (deprecated)
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