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This categorical prohibition connects with the preceding passages inasmuch as it serves as an additional protection of individuals against possible slander. In its wider purport, it postulates the inviolability of each person's home and private life. (For the socio-political implications of this principle, see State and Government in Islam, pp. 84 ff.)
The conventions of propriety and privacy are essential to a refined life of goodness and purity. The English saying that an Englishman's home is his castle, suggests a certain amount of exclusiveness and defiance. The Muslim principle of asking respectful permission and exchanging salutations ensures privacy without exclusiveness, and friendliness without undue familiarity.