The Islamic community is a festive community. Let us say you are walking in the street and you get tired. You go and knock the door of a random house and say, "As-Salam alaykum." You would be invited in and the host would welcome you, saying, "Come in and dine with us." When night falls, the host would ask you to stay the night and if you like it, you do. This is how the Muslim community is; this is how it was at the time of the companions of our Prophet (saas). Later on, these niceties were forgotten in time. - Harun Yahya