(2:234) If those of you, who die, leave wives behind, they should abstain (from marriage) for four months and ten days. *259 Then when their waiting term expires, they are free to do whatever they choose for themselves, provided that it is decent; you shall not be answerable for this; Allah is fully aware of what you do.

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*259). The waiting period owing to the death of the husband is obligatory even for a woman with whom consummation of marriage has not taken place. A pregnant woman, however, is exempted from this. Her waiting period expires the husband's death and the childbirth is less than the waiting period prescribed by Law.
'To observe a waiting period' does not mean merely that they should refrain from marrying, but also from self-adornment.
Hence we find categorical directives in the Hadith that a widow should neither wear colourful and showy dresses and jewellery, make use of henna, kohl, and perfumes, nor set her hair in an attractive style. There is disagreement, however, as to whether the widow may go out of her house during the waiting period. 'Umar, 'UthmaAn, Ibn 'Umar, Zayd ibn Thabit, Ibn Mas'uid, Ummn Salamah, Said ibn al-Musayyib, Ibrahim al-Nakha'i, Muhammad ibn Sirin and the founders of the four legal schools are of the opinion that during the waiting period a woman should stay in the house in which her husband died. During the daytime she may go out to do necessary errands, but her residence should be her own home. On contrary, 'A'ishah, Ibn 'Abbas, 'Ali, Jabir ibn 'Abd Allah. 'Ata'. Ta'us, Hasan al-Basri. 'Umar ibn'Abd al'Aziz and the Zahiris are of the opinion that a widow may spend her waiting period wherever she likes, and may even go on journeys. (See the commentary on the verse in JassAs. vol. 1, pp. 418 f. - Ed.)